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When Trek began in 1976, their mission was simple: Build the best Trek bikes in the world. Today, they have added to their mission: Help the world use the bicycle as a simple solution to complex problems. Trek. We believe in bikes.

Trek Bicycle Corp is a bicycle and cycling product manufacturer and distributor under brand names Trek, Electra Bicycle Company, Gary Fisher, Bontrager, Diamant Bikes, Villiger Bikes and, until 2008, LeMond Racing Cycles and Klein. With its headquarters in Waterloo, Wisconsin, Trek bicycles are marketed through 1,700 dealers across North America, subsidiaries in Europe and Asia as well as distributors in 90 countries worldwide.

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NOTE : Trek ownership can only enjoy Life-time warranty, 1 year cosmetic defect, recall of defect will be 100% covered by TREK global if purchase from Trek Bikes authorized re-sellers in Malaysia.

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TREK SLASH 9.9 X0 GEN 6 REVIEW

Words by Drew Rohde  |  Photos by Staff

After nearly six months of abuse, conversations with Trek Bikes HQ and a YouTube Service Bulletin video full of interesting comments, we’re kicking off the new year with a high pivot, Gen 6 Trek Slash review that should be another great conversation piece as one of the hottest bikes of 2023. We’ve been fans of many of Trek’s bikes over the last few years from the Session DH bike to their Fuel EX and Fuel EXe and of course, the last generation Slash . We first rode the Gen 6 Trek Slash during Crankworx Whistler, where we filmed a Dissected Feature with their engineer: Trek athlete Casey Brown and more. Since then, we spent the rest of summer in the bike park, pedaling backcountry trails and yes, filming a service video on the famous “Chain dropping” issue that commenters had us thinking was affecting nearly everyone who owned one of these bikes. But…as the saying goes, don’t believe everything you hear. Even if you don’t believe what we’ve got to say when it comes to the goods and bads of the new Trek Slash, we think you’ll find it entertaining at least.

QUICK SPECS

• 170mm High Pivot ABP Suspension • Mixed Wheel (29”F/27.5”R) as standard, dual 29” option • HTA 63.3 • STA 76 (effective) • REACH 490 (Large)

FULL BUILD SPEC

CHASSIS Frame: OCLV Mountain Carbon | 170mm Fork: RockShox ZEB Ultimate 170mm | Charger 3 RC2 Shock: RockShox Vivid Ultimate 230x65mm

COCKPIT Brakes: SRAM Code Silver | 200F/R Centreline rotors Bar/Stem: Bontrager RSL Integrated | OCLV Carbon | 820mm | 27.5mm Rise | 35mm Length Headset: Integrated Sealed Bearing Seatpost: RockShox Reverb AXS | S: 100mm, M-XL: 170mm Saddle: Bontrager Arvada

WHEELS Hubs: Bontrager Rapid Drive 108 Rims: Bontrager Line Pro Carbon Front Tire: Bontrager SE6 Team Issue | 29″ x 2.5″ Rear Tire: Bontrager SE5 Team Issue | 27.5″ x 2.5″

DRIVETRAIN Bottom Bracket: SRAM DUB Threaded Cassette: SRAM Eagle XS-1295 | T-Type | 10-52T Cranks: SRAM X0 Eagle | T-Type | 30T | 165mm length Shifter: SRAM AXS POD Ultimate | 12s Derailleur: SRAM X0 Eagle AXS | 12s

Downhill performance is incredible

Rear suspension plush yet solid

Fast and Confident

Bike Park shredder

Vivid Ultimate

WE DON’T

3 Dropped chains (fix appears to work)

Steep, chunky climbing

About The Trek Slash Gen 6

Packing 170mm of travel out back, the new Trek Slash claims to be a 70/30 bike, meaning Trek designed the bike to have a 70% downhill bias with a 30% nod to climbing and uphill capabilities. Needless to say, this isn’t your run of the mill XC or all-mountain bike. It’s designed and built for riders who prioritize downhill speed, composure, and confidence on the gnarliest terrain over efficiency and climbing performance.

Since this review is likely going to get a bit long, we’ll link to our Dissected Feature which has a written interview, all the tech details and a video interview and presentation on the Gen 6 Trek Slash. If you’d like to check that out, click here.

If the CliffsNotes version works for you then we’ll gloss over a few key features:

FRAME AND FEATURES

Updated for 2023, the high pivot Trek Slash Gen 6 can be run with a number of wheel size configurations and can take up to a 190mm travel fork but comes with a 170mm fork and mixed-wheel setup as standard. Riders can choose a full 29er race machine, 27.5” aggro-shredder or put a dual crown 190mm with a mullet and have a mini-Session bike park rig.

With many people loving the last generation Slash, some may have wondered why Trek opted to go to a high pivot and run two idlers? Well, with Trek’s other bikes creeping up in capability and riders wanting to go faster and bigger, it seems many brands are making their bikes bigger and burlier, and of course, more high-pivoty. Trek Slash engineer, Matt Yerke told us that even though the bike’s 70% focused on DH performance, they took time to keep it versatile and pedal-friendly, as a mountain bike should be. Did they deliver? We’ll see down below.

BUILD SPECS AND VALUE  

With bikes starting at $4,399 and going up to $11,499, our Slash 9.9 X0 AXS sits on the higher end of the spectrum at $9,399 and comes with a dialed spec. If we were spending our own money however, we’d likely be checking out the Slash 9 or Slash 9.8 XT models.

Chain Drop Service Bulletin and Notes from Trek

We published this How To Video to address some of the popularized videos and comments talking about chain drop on the new Trek Slash. After publishing this video and seeing all the comments, we reached out to Trek as it had us reconsidering our official stance on the long-term review you’re about to see below. The statement below from Trek, which we are taking as truthful, made us feel better and also aligned with our notions of what we’ve observed. Trek passed our concern around their Customer and Dealer Service teams and below is a small excerpt.

“First off, Trek Bicycles and I would like to acknowledge that it is frustrating to buy a nice new bike that doesn’t work exactly like it should out of the box. Luckily however, it has been a very small number of people affected and thankfully they have been far less upset than what online commenters may have you believe.

Trek’s customer service team has actually received way more calls about internet comments talking about chain drop than actual Slash owners who are experiencing the issue. We have found that a handful of riders said the fix did not entirely solve their dropping issues. We have sent out early units of our updated idler wheel to that handful of riders, one of which is Ryan Howard, who has been spending a ton of time on his Slash. We’ve been pleased to hear that those riders are no longer having any drop issues.

These will ship to dealers at no cost for any Slash owners who want to get one.” – Ross Rushin // MTB Product Manager

When evaluating the new Gen 6 Trek Slash 9.9 X0 AXS against the previous generation Slash and current offerings from other brands in this genre, the Slash commands attention. As with any purpose-built product, the things that make it excel can also alienate or turn off others. I’m traditionally not a huge fan of high pivot bikes, though I’ve grown to like mid-high pivot bikes for certain applications. Rocky Mountain’s Powerplay eBike and the Trek Session , which we reviewed last year, are two examples of mid-high pivot bikes that I like quite a bit.

Chances are you’ve already heard the touted claims of high pivot bikes since they’ve been so heavily marketed over the last couple of years, so we’ll save you the pitch. What is undeniable though, is that they can charge over terrain and obstacles a bit better than other designs, but only if they are tuned and designed well. We have ridden some high pivots that don’t really improve much, but suffer the downsides of a high pivot, but we’re happy to report that Trek has avoided this ill fate.

SETUP | Setting up The Trek Slash was one of the easier tasks of the year. It required almost zero tuning, customization or tinkering with to feel amazing. If you’ve read our older Trek reviews, you may recall us being a bit critical about the tune being a bit too mellow, which led to heavier or more aggressive riders needing to add maximum volume reducers or going our route, contacting Fox Shox to weasel a Trek Factory Racing tuned shock, which did wonders for the bike. This is no longer an issue as Trek seem to have finally identified that if they’re going to design an aggressive bike for aggressive riders, they need to have a shock and tune that are ready for it.

The most time-consuming part of our review bike’s set up was removing the one-piece Bontrager bar and stem combo unit and replacing it with our favorite OneUp Components Ebar and stem. This resulted in a better body position and way less hand fatigue.

DESCENDING | Trek has done a great job of making the new Slash’s suspension absolutely devour hits of all sizes. The RockShox Vivid Ultimate rear shock only compliments the insane capability of the Slash’s rear end. It is possibly the smoothest, best feeling rear suspension I’ve felt in a while. For me, a rider who loves smashing, gapping and floating rough, chunky downhill trails, it offers a very nice platform for support and control, but gets out of the way offering a bottomless and smooth feel. I could have been tricked into thinking a coil shock was mounted out back based on the composure and smoothness.

When it comes to downhill performance, the Trek Slash may be the best descending mountain bike we rode in 2023! It absolutely shreds trails with ease and begs to go faster. Whether we were lapping blown-out end of season bike park trails or remote backcountry downhills, the Slash leads the way. In fact, we can’t think of any bikes that aren’t downhill bikes that we’d want to ride in a bike park more than the Slash. The speed this bike carries, composure over braking bumps, big and little hits as well as the way it corners make it a really impressive machine.

The downside is, the compliance combined with the weight, makes this bike a little bit tougher to jib on smaller features at slower speeds. It absolutely still gets off the ground and is fun to play on, it just requires a bit more muscle to get it up and tweaked. Granted, this rocket ship wasn’t designed with lower speeds in mind, and it shows with a list of Personal Records that our various testers achieved.

Another downside is that the bike does have more stuff to go wrong. Whether you’re one of the unlucky riders dropping chains – which we did three times before the service bulletin addressed the issue – or not, more moving parts, extra chain links, and more nooks and crannies all mean more chances for things to go wrong.

CLIMBING | Along with the above concerns, the climbing performance of the Gen 6 Slash certainly isn’t what its outgoing sibling offered. Since taking possession of the Trek Slash 9.9 XO AXS we’ve had four riders put time on it. Two of which owned previous generation Trek Slashes. All riders agreed, like Trek claims, this bike is a definite 70/30 bike, and the climbing performance is tolerable in certain situations like fire roads and smoother trails, but can be a struggle on more steep, technical trails with larger obstacles that want to eat your momentum.

The weight is noted, and while the drag may be a claimed 3%, it felt a bit closer to 10% in practice. That could be exacerbated by the lengthening rear end – yes, the same thing that makes high pivots so great, also works against it.

It’s been a while since we graduated but, we think someone smart once said something about actions having reactions, but we didn’t pay close attention in school so maybe we’re making it up. Either way, when speeds are low, the grade steep and effort high, we found that the rear end could “stall” as we tried to pedal over roots or rocks, sucking our energy and momentum in the process. Much the way the rear end grows to get up and out of the way of an impact while descending, as you climb and hit an obstacle, the front continues to creep up the hill as you grind away at the pedals. However, the rear wheel goes backwards before going up and that delay can make it feel like you’re pedaling harder to get up and over that obstacle, which means more energy and slower times. Of course, this bike wasn’t designed to race up the hill, it’s meant to go down. If your energy is spent on the way up, however, it could be worth considering you may be more fatigued when that race timer starts.

FINISH AND VALUE | Now, as amazing as the bike is, we did in fact drop the chain three times over the six-month test period we had. Since the repair, we didn’t drop the chain, however we only had a few rides on it before winter hit, so we can’t say with 100% confidence it’s gone, but we are pretty certain that with the updated spacing and especially the new idler wheel, we’d be in good shape. You may want to wait until the updated idlers hit, hopefully February of 2024, but in the meantime the chain dropping issue may not be quite as bad as commenters may have you believing.

The rest of the bike is a nicely put together package. Trek paint had some years known for being a bit, soft we’ll call it, and while it’s still not as durable as we’d like, it’s a lot better. Though we’d recommend a frame wrap, of course, we’d recommend that on any bike, so maybe not a surprise there. If you stop, look closely and examine the details of this bike, it does look very nice, has quality bits, nice hardware and a very classy overall appearance. Trek have done a nice job making this a drool-inducing bike.

The Wolf’s Last Word

Price: $9,399 Weight: 36.4lbs Website: Trekbikes.com

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Trek Slash Review | A totally one-of-a-kind custom bike build

The not-so-minor details.

Trek Slash 8

Trek Bicycles Australia

https://www.trekbikes.com

$3,312 AUD (frame only)

Last year saw Trek pull the wrappers off of its all-new Slash enduro bike. Featuring a redesigned chassis with in-built downtube storage, the 2021 Trek Slash received a whole suite of updates, including a brand new rear shock that was codeveloped alongside RockShox. Our two testers, Ben & Dan, were thoroughly impressed with the supple suspension and the bike’s ability to monster-truck its way through horrendously rocky and technical terrain. However, it was the Slash’s agility that was the real surprise, giving it an approachable and easy-to-manage demeanour on less gnarly singletrack. Despite its EWS-level capabilities, the Slash is a proper all-rounder.

The bike we tested prior to the official launch was the top-end Slash 9.9 X01. However, Trek offers three other models beneath it, with the Slash 7 being the cheapest option at $4,999 AUD. For those who want to build something a little different, there’s also the option to buy the Slash frameset.

And that’s exactly what Ben decided to do.

Going Off-Script With The Trek Slash

But first, allow us to introduce you to our fellow Flow Frother.

Ben is a full-time bike shop guru, a skilled mechanic, and an appreciator of very robust IIPAs. With some three decades of riding and bike industry experience behind him, he’s also a talented and discerning rider, with an infectious enthusiasm for geeking out on new bike tech, while simultaneously being a connoisseur of fine retro collectables. Notable highlights in the shed include a Klein Mantra, Shimano Airlines groupset and a Manitou X-Vert Carbon. Not that Mick is jealous or anything.

After being thoroughly impressed with the Slash 9.9 X01, Ben heard through the grapevine that Trek Australia would be bringing in a very limited number of Slash framesets into the country. One impulse-purchase later, and a Slash 8 frame was on order.

To assemble his custom Slash, Ben’s chosen an eclectic build kit that is comprised of a variety of components that he’s been testing for Flow, along with a few parts that were purchased specifically for this bike. The build hasn’t stayed still either – a number of components have already been swapped around in search of the perfect setup, and there are a few upgrades planned for the future too.

Without further ado, let’s get stuck into the build and Ben’s impressions of this one-of-a-kind Trek Slash and some of the parts strapped to it.

The heart of any bike is the frame, so let’s start there Ben. Why did you go for the Slash?

Well I had been hankering after a big bike for a while after many years of riding XC and trail bikes. I used to ride and race a lot of DH in my younger days and have never quite been able to let it go! The Slash just had this great mix of playfulness and agility, whilst also being able to just steamroll through techy sections and feel very planted and confidence inspiring. It’s super fun to ride.

I opted for a frame only option as by the time I had decided to order one, only a few days after the official release, the complete bikes had already been snapped up! Lead times on the second shipment of complete bikes was far too long for my impatient nature so I sourced a frame before they all disappeared.

Did you choose the alloy frame specifically over the carbon option?

I never really considered the carbon option as I wanted a bike that I could be less delicate with and worry less about when tackling the extremely rocky local trails we have here. The added weight didn’t phase me, I have other bikes that are light and fast uphill, and that’s not what I bought the Slash for. The alloy Slash 8 frame (and complete bike) are perhaps the sweet spot in the Slash line up as it shares the same Rockshox Super Deluxe Ultimate Thru Shaft shock that you’ll find on the more posh carbon 9.8 and 9.9 models. This shock is a big part of why the Slash handles as well as it does, so it’s cool to see it offered on the alloy frame as quite often alloy models receive a more basic shock.

The alloy frame sells for nearly half of the carbon frame option with the same shock.

As with the carbon frames, the alloy Slash still gets the new downtube storage accessed by a trapdoor under the bottle cage, adjustable geometry via the Mino Link and generous downtube protection. Price was also a consideration. I already own a… ahem …not insignificant amount of expensive bikes so there wasn’t much scope for a full on enduro dream machine. The alloy frame sells for nearly half of the carbon frame option with the same shock. I’m never going to be at the pointy end of an enduro race so the alloy option was a bit of a no brainer.

That Trust fork is absolutely bonkers! Why the heck is that on there?

Ah, yes, the elephant in the room! The Shout is the second fork from the now COVID coma-induced Trust Performance. Trust was founded by three industry veterans, most notably the hugely influential Dave Weagle. Both Trust fork models, the 130mm Message and the 178mm Shout are linkage driven forks made almost entirely of carbon fibre and feature an air spring in each leg and a three-position damper unit in one leg.

Linkage driven forks are nothing new but these are perhaps the first to really benefit from the engineering flexibility of modern carbon fibre, while adding in intricately adjustable dampers and air springs.

I really feel the Trust forks are one of those products that, whilst not perfect, has perhaps paved the way for others to try something different.

I actually didn’t intend on building the Slash with the Trust Shout fork to begin with. I had a perfectly nice set of Lyrik Ultimates ready to go but the Trust came up for sale on the second hand market just as I was finishing the build, and I couldn’t say no! I have the shorter travel Trust Message fork on another bike and love it, so I was really keen to see how the 178mm Shout fork would feel.

I’m drawn to the more outlandish bicycle and component designs as these are what can push the envelope of what we currently ride and the way we think about bike and component design. I think that’s one of the reasons I have such a love for vintage mountain bikes. There was so much experimentation back in the day and lack of concern about what company shareholders would think. Don’t get me wrong, there were a lot of mis-steps but they have all in some way shaped the pretty amazing mountain bike and parts we ride now. I really feel the Trust forks are one of those products that, whilst not perfect, has perhaps paved the way for others to try something different.

You’ve since fitted a more conventional telescopic fork. How’s the performance in comparison?

Yeah I’ve now fitted a 170mm 2020 Lyrik Ultimate upgraded with the new C1 Debonair spring . It has really changed the way the bike behaves in a number of ways.

Instantly noticeable was the improvement in small bump sensitivity, particularly on very rocky, slower sections of trail, both uphill and downhill. The main weakness of the Trust fork was its climbing performance, admittedly not the designers’ biggest concern when making the fork but worth mentioning. The Trust fork tends to sit really high in its travel, raising the front of the bike and making slow, technical, rock-strewn climbs particularly tough going. The Lyrik is much plusher off the top, which naturally tends to lower the front end as you shift your weight forward. The initial suppleness also does a better job of soaking up momentum robbing rocks that can be the difference between cleaning a tech climb or not.

The difference between the forks when the terrain points down is interesting. I felt the Trust shines on high speed flow trails, where the stiffness and lateral rigidity of the huge carbon legs allows you to corner and carry speed in a way that makes you feel as though you could give Greg Minnaar a run for his money! The Lyrik still feels great in comparison on this type of descent but doesn’t quite give you the confidence to really let go on the corners like the Trust does.

When the descents become more technical and rocky the Trust does not feel as composed as the Lyrik, there is definitely a lot more feedback through the bars. The Lyrik does a better job of smoothing out the trail but the Trust feels faster and as though it carries more momentum. The rearward axle path of the Trust’s initial stroke has a lot to do with this as the wheel can more quickly move out of the way of an incoming rock, minimising its effect on your forward motion. It will be interesting to go back to the Trust after some time on the Lyrik to see if it highlights any other differences.

Let’s talk about the Crank Brothers Synthesis Alloy wheels; how have those held up?

Yeah, I’ve been testing out the entry level Crank Brothers Synthesis Alloy Enduro wheels, which sell for a reasonable $945 AUD and weigh in at 2,130g for the pair. Like the carbon versions, these wheels are designed and built differently front and rear to provide different ride qualities.

The front rim is 31.5mm internally compared to 29.5mm for the rear, the front also has 28 spokes where the rear has 32. Crank Brothers reckons the wider rim profile better supports a wider front tyre for cornering stability whilst also rounding the tyre’s profile, which again can help in the corners. The lower spoke count theoretically reduces front wheel stiffness a touch, potentially allowing a touch more compliance through choppy corners where an overly stiff front wheel can ping off rocks and ruts and leave you feeling sketchy.

The narrower rear rim is meant to better match up with a narrower, faster rolling rear tyre. The 32 spokes provide a laterally stiffer wheel, allowing more precise tracking through the corners.

It’s especially noticeable on technical climbs, I found myself second guessing every pedal stroke when trying to pick a line over rocky climbs.

The wheels have held up pretty well, suffering only a minor ding to the rear rim. This is no slight on the rims though, our trails are very rocky and I’m sure any alloy rim would have sustained some damage. Overall the wheels felt fine, not too flexy, not too stiff. This could be down to the difference in stiffness Crank Brothers reckon it has designed into the wheels, but this is hard to quantify.

The major issue for me with these wheels is the sluggish engagement of the rear hub. It’s 17 degrees, which is very slow, and I reckon for a nearly a $1000 wheelset these days is unforgivable. It’s especially noticeable on technical climbs, I found myself second guessing every pedal stroke when trying to pick a line over rocky climbs.

On the plus side the wheels are built with readily available J-bend spokes, external nipples and easily sourced cartridge bearings meaning they will be easy to maintain and live with. However, replacement rims aren’t particularly cheap at $195 AUD each. This is definitely worth factoring in if you are a frequent rim muncher.

My overall verdict on the Synthesis Enduro alloy is that they could really benefit from a higher-engaging freehub to be competitive with other wheels out there at this price point, or they need to come down in price. Whilst the differing ride qualities built into the front and rear is a nice concept, I personally haven’t found the benefits noticeable enough on the trail to justify the price or overcome the drawbacks of the rear hub.

Now you’re on the carbon Bontrager Line Pro 30 wheels. How do they compare?

After riding the Synthesis wheels, I then fitted a set of Bontrager Line Pro 30s. These sell for considerably more at $1,999 AUD, but they’re also lighter at 1,881g for the set, including rim strips and valves (you can get the full tech rundown on these wheels in our separate tech feature here ).

When I swapped wheels, I kept the same tyres and overall setup for the whole bike, in order to isolate the performance differences as accurately as possible. And in comparison, they feel great, lighter and more direct on the trail. They are 250 grams lighter than the Crank Brothers wheels, which doesn’t sound like a lot but it is definitely noticeable. The carbon rims add to the feeling of directness, without feeling harsh or chattery like some carbon wheels can (like previous generation Bontrager carbon wheels).

The rear hub features the Rapid Drive 108 freehub mechanism, which offers 3.3 degrees of engagement. This is super fast, especially when compared to the 17 degrees on offer from the Crank Brothers wheels.

Bontrager claims that the rims found on the new Line Pro 30s are the strongest it has ever tested . We’ll have to take this with a grain of salt as testing is obviously done in house. Bontrager does back all of its carbon wheels with a lifetime warranty and a 2 year “ no questions asked ” crash replacement policy though. Damage your carbon wheels within a 2 year period and Bontrager will replace them. This is increasingly common in the carbon wheel market these days but still pretty cool to have that peace of mind when purchasing.

Would you recommend either wheelset over the other?

I prefer the Bontrager wheels over the Crank Brothers but they are twice the price, so it’s not a fair comparison. I personally love the direct and lively feel of a stiff carbon wheelset. These qualities worked well with the Slash’s super supple rear suspension as the wheels could handle the speed I found myself entering with into chunky rock gardens and off-camber sections.

By comparison the Crank Brothers wheels didn’t feel as positive or stiff. This could actually be a good thing though, particularly for lighter riders or those on hardtails who are looking for a bit more compliance from their wheels. I’d personally like to see a quicker-engaging freehub, but if you’re not so bothered by that, they’re a solid set of hoops for under a grand.

It’s worth mentioning the Bontrager wheelset that sits below the Line Pro 30, the Line Elite 30. These wheels are $1,499 AUD and feature the same Rapid Drive 108 hub internals and the same warranty support, but are built with slightly heavier carbon rims and J-Bend spokes. The Line Elite wheels are only 130 grams heavier, and in my mind would be worth considering when looking for an off-the-shelf wheelset.

What tyres are you currently using?

I’ve been running a Maxxis Minion DHF EXO 2.5in up front and a Maxxis Dissector EXO+ 2.4in on the rear, both with the 3C Maxx Terra rubber compound. The Minion DHF weighs in at 1,065 grams, but while the Dissector is meant to have a heavier duty EXO+ casing, it’s actually quite a bit lighter at 925 grams.

The Minion DHF, as we all know, is superb and provides a ton of confidence up front. The Dissector certainly rolls well for an aggressive tyre but hasn’t given me the confidence that the Minion did. The Dissector did also suffer a ride-ending pinch-flat after sustaining a big hole on the bead and through the top of the casing. I’m not hard on tyres so this was a bit disappointing. If you’re a certified tyre shredder then consider the tougher Double Down casing, particularly on the rear tyre. That’s exactly what I’ll be ordering shortly!

You’ve been testing the Shimano Deore 1×12 drivetrain too. Give us the lowdown on your experience so far.

Listen up bike snobs (myself included) – Shimano Deore 12 speed is bloody amazing, seriously impressive! The shift quality is superb, particularly when shifting into harder gears as it uses the same HG+ cassette design as SLX, XT and XTR 12 speed groupsets. I ride the XTR 12 speed groupset on my XC bike and honestly the difference between this and the Deore groupset is so small. The shifter feels a touch softer and a little less positive than XTR but the actual difference in shift quality is negligible.

I do miss the multiple upshift offered by XT and XTR shifters but if you’ve never ridden with this it won’t be an issue. It has not given me a mis-shift or any cause for concern since it’s been fitted to the Slash, its performance is outstanding, especially considering the cost of the entire groupset is less than the cost of a cassette from a top-tier groupset from either Shimano or SRAM.

I think in the long term I would consider upgrading the cranks and the cassette as these components are pretty heavy. Changing to XT cranks and cassette for example would save nearly 300 grams without sacrificing any strength or durability (for confirmed weights and a closer look at the full Deore M6100 groupset, check out our detailed tech feature here ).

What about the Deore M6120 brakes?

The Deore four-piston brakes have been impressive with good power and modulation. Fitting and set up is simple and straightforward, and the bleed process is the same as all current Shimano models. I’ve paired them with Shimano XT Ice Tech 180mm rotors front and rear.

Modulation on Shimano’s four-piston brakes is improved over their less powerful two-piston models, and there’s a really nice power progression as you move through the lever stroke. The lever feel was consistent throughout the test, with none of the wandering bite point that some Shimano models have had a problem with.

I will say that the stock resin pads didn’t quite give the bite that and power that I was used to from sintered metal pads though. Unfortunately I couldn’t find anywhere that had stock of sintered Shimano pads to suit these Deore callipers, and it’s worth noting that the finned pads for the four-piston XT and SLX brakes are not compatible with these Deore callipers.

One of our main suppliers at the shop had just started doing Galfer pads and rotors so I’ve since fitted a pair of the standard compound pads, which made a big difference to braking power and firmed up the lever feel at the bite point. For anyone with Shimano brakes who’s looking for more power over the stock resin brake pads, I can highly recommend upgrading to some sintered or semi-metallic pads.

Tell us about the rest of your bike’s cockpit setup.

I’m running a 45mm long Bontrager stem, which clamps a 35mm One Up carbon bar with 20mm of rise. I’ve cut these down from 800mm to 780mm. Currently I’m riding the ODI Elite Flow grips and a 180mm travel OneUp dropper, which is paired to the Shimano dropper lever.

The OneUp bar is super comfortable due to its flattened, oval shape that allows some vertical flex whilst still retaining fore and aft stiffness. They are a huge improvement over the PRO Tharsis carbon bars I initially built the bike with, those things are really stiff, and I found them to be quite harsh.

The dropper has also been top-notch, though I’m not in love with the Shimano lever. It works fine, and the textured paddle is nice, though the return spring requires more thumb force every time you press the paddle, and the physical position of the paddle is too close to the grips. Some further adjustability, or just a bit more clearance between the paddle and the grip would be nice.

What do you love most about it?

As I mentioned before, the bike’s ability to feel lively, and chuckable whilst still feeling planted and stable when needed, is a great quality. The rear shock and shock tune is superb as well, really smooth and supple at the top off the top, supportive in the mid stroke and ramps up nicely at the end of the travel.

I also really like the Knock Block steering limiter, which has been essential in previous generations to stop the fork crown slamming into the downtube. With the new Slash, this is no longer needed but it still prevents brakes and shifters whacking your top tube in a crash. This also allows you to run nice tidy cables and brake hoses without worrying about them getting damaged in a crash when the bars try to fully rotate. The turning radius on the Knock Block has been increased over the previous generation, it also comes with a replacement chip to allow for complete removal, if you feel like trying to channel your inner Brandon Semenuk!

Any other changes on the horizon?

I’d like to try and squeeze a 200-210mm travel dropper post in there if possible, just to get the saddle more out of the way on some of the really steep sections. To help minimise rock strikes I’ll probably switch to 170mm crank arms. Only the 175mm arms were available at the time of launch, and while they haven’t been a huge issue, any reduction in your pedals smacking into rocks is a plus. I’ll probably switch to a Wolf Tooth dropper remote at some stage too.

In the longer term I’d love to give the Vorsprung Secus a go on the Lyrik Ultimate. The Secus is essentially an enlarged negative air spring that actually sits outside of the fork at the base of the lower leg. It’s supposed to give your air fork a “ coil like feel” in the top 2/3rd of the travel whilst providing a more gentle ramp up at the end of the travel.

The only other more immediate change will be an Absolute Black oval chainring, as I bloody love those things. I’ve used them for years now on almost every bike I own, I find they really help smooth out power delivery on steep, loose pinches, which helps prevent a loss of traction at a critical moment. I’ve ridden them for so long that normal round rings feel a bit weird!

Ben’s Custom Trek Slash 8 Specs

• Frame |  Alpha Platinum Alloy, ABP Suspension Design, 160mm Travel
• Fork | RockShox Lyrik Ultimate, Charger RC2 Damper, 42mm Offset, 170mm Travel
• Shock |  RockShox Super Deluxe Ultimate, Thru-Shaft 3-Position Damper, 230×62.5mm
• Wheels | Bontrager Line Pro 30, Carbon Rims, 30mm Inner Width
• Tyres | Maxxis Minion DHF 3C Maxx Terra 2.5WT Front & Dissector EXO+ 3C Maxx Terra 2.4WT Rear
• Drivetrain | Shimano Deore 1×12 w/Deore 32T Crankset & 10-51T Cassette
• Brakes | Shimano Deore 4-Piston w/180mm Rotors
• Bar | OneUp Carbon, 35mm Diameter, 20mm Rise, 780mm Wide
• Stem | Bontrager Line, Knock Block, 45mm Length
• Grips | ODI Elite Flow Lock-On
• Seatpost | OneUP Dropper, 34.9mm Diameter, 180mm Travel
• Saddle | Bontrager Kovee Elite
• Size Tested | Large
• Confirmed Weight | 15.75kg (without pedals)
• RRP | $3,312 AUD (Frame & Shock)

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Field Test: 2021 Trek Slash - Ready to Race

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2021 Trek Slash is a completely different beast

Redesigned enduro racer gets more capable and more convenient

As one of the first enduro-focused 29ers, Trek's Slash was starting to show its age. It has enjoyed racing success under Katy Winton, Pedro Burns and Florian Nicolai, but its geometry was getting left behind by rivals such as the new Specialized Enduro .

So, as you might expect, the all-new Slash is far more up to date. It's designed to thrive on the ever more demanding terrain seen at enduro races, with more suspension travel and longer, lower, slacker geometry.

It's also got a steeper seat tube angle and a lighter frame, so it should climb better too. What's more, it's gone one up on Specialized by offering internal down tube storage in both the aluminium and carbon frames, along with a few features unique to Trek.

We've already seen the new bike racing at the first round of the EWS in Zermatt, Switzerland, and now we can share all the details.

2021 Trek Slash geometry

Perhaps the most important update is to the Slash's shape.

It still uses Trek's Mino Link system, which can raise or lower the bottom bracket by 7mm while altering the head and seat angles by half a degree, and because we usually rode the old bike in its low setting, we'll compare the new geometry in that configuration.

The head angle is now 1-degree slacker, at 64.1 degrees in the low setting; the reach has increased by 15mm to 40mm size-by-size (the largest frame now has a whopping 515mm reach); the wheelbase has grown by 25mm to 50mm depending on size. Pretty much all of this growth comes from the front-centre because the rear-centre has only increased by 2mm, to 437mm.

Meanwhile, the bottom bracket drop has increased by 8mm, and now sits at 345mm in the low setting. That's quite low for a bike with this much travel.

One particular criticism of the old Slash was the slack seat tube angle, which made it tricky to tackle steep climbs. And while the travel-adjustable fork on some models helped a little, it was almost an admission of the problem. Well, it's now 2 degrees steeper, measuring 75.6 degrees in low and 76.1 degrees in high.

This is still a bit slacker than some of its rivals, but definitely a step in the right direction.

• What’s the future of MTB geometry?

To complement the longer reach numbers, Trek is speccing very short 35mm stems across all sizes, along with (now almost ubiquitous) short offset forks.

Internal storage in alloy frames as well as carbon

While Trek certainly wasn't the first to think of turning the down tube into a handy storage area, it's brought the idea (which we're big fans of) to more people.

We first saw Trek do it with the Fuel EX trail bike and Domane road bike . In the case of the Slash, both the carbon and alloy frames have the handy compartment for snacks, pumps, tools and the like, while Specialized only offers down tube storage on its pricier carbon frames.

With the cheapest Slash coming in at £2,650, Trek's internal storage is available at a lower price point.

Trek Slash suspension

Trek has boosted the suspension travel by 10mm at each end – it now serves up 160mm in the rear and 170mm up front.

The Slash still uses Trek's ABP (active braking point) suspension system, which works a bit like a Horst-link design, but the chainstay pivot is placed further back and is concentric with the rear axle.

Unlike a single-pivot layout, the brakes are not directly connected to the rear swingarm; this causes the suspension to sit higher in its travel under braking, where the suspension is softer.

While the layout looks similar to the old, the main pivot has been raised slightly to give the bike a bit more anti-squat, so it should pedal more efficiently.

• Click here for more on suspension designs and the differences between them

Some Slash models use Trek's Thru-shaft shock technology, with a Thru-shaft version of the RockShox Super Deluxe shock. Thru-shaft shocks have a damper shaft that goes all the way through the damper body and out the other side. This means the shaft doesn't displace any extra oil as it enters the damper.

This allows Trek to dispense with the dynamic internal floating piston (IFP), which compensates for the oil displaced by the shaft in most shocks. Trek claims this reduces friction so the shock changes direction faster and tracks the ground better.

However, it's worth remembering that IFP friction is only a small component of the total friction in a shock, particularly an air shock. Also, the Thru-shaft design requires a second shaft seal where the shaft exits the damper, which inevitably adds some friction back in.

Trek insists the removal of the IFP more than makes up for this, but we'd say that any reductions in friction resulting from Thru-shaft are unlikely to be game-changing.

The Slash is compatible with some non-proprietary shocks (in fact, two of the less expensive models come with regular, non-Thru-shaft shocks). However, the standard RockShox Super Deluxe won't fit because the lockout lever hits the frame.

The proprietary RockShox shock has a few interesting features besides the Thru-shaft damper. There's a lockout lever for climbing, plus a three-position dial to adjust the low-speed compression damping in the open mode. The rebound dial sits behind this and is numbered to make it easy to tell which rebound setting you're in without counting clicks.

The shock also has a larger negative spring volume than the standard DebonAir can. This means it should be softer at the start of the stroke, but firmer after sag. Apparently this change was inspired by the RockShox MegNeg air can , but it's not quite as extreme.

Interestingly, Trek has moved away from its RE:activ regressive damping technology, first used in 2014, in favour of shimmed valves. This change is apparently because modern enduro racing demands sensitivity over pedalling efficiency.

Knock Block 2.0 is better, and it's optional

Knock Block is Trek's system for stopping the bars turning past a certain angle. This has two advantages: first, it prevents the brake levers hitting the top tube or the cables pulling out if the bars spin in a crash. Second, it allows Trek to design straighter (and therefore lighter) down tubes because they no longer need to curve upwards to avoid the path of the fork crown when spun round.

The Knock Block 2.0 in the new Slash is only there for the first reason, because the curved down tube on the new Slash clears the fork crown. The new Knock Block allows a greater steering angle than before – the bars can turn by 72 degrees, up from 58 degrees. This should allow for tighter turns, but we rarely found the steering lock of the old system to be a problem on the trail .

It's also removable, so if your stunt repertoire is broader than ours you can still turn the bars as much as your cables will allow.

Big seat tube for big dropper posts

Fans of standard conformity will be disappointed by the 34.9mm diameter as well as the proprietary shock. The stouter seat tube standard is not unique to Trek, but it is less common than 30.9 and 31.6mm diameters. The idea is to increase space for dropper post internals and boost reliability and stiffness.

The seat tube insertion length has been increased too, allowing the use of longer travel dropper posts. Complete bikes are equipped with droppers from 150mm to 200mm (Medium and Medium/Large sizes get 150mm posts, Large frames get 170mm, XL frames get 200mm).

It's a little heavier, but still light

Trek claims the 2021 carbon frameset weighs just 2,450g without the shock. It credits this low weight (for an enduro frame) to Trek's OCLV carbon layup and the fact that the ABP suspension layout has a pivot concentric with the rear axle rather than on the chainstay, which apparently makes for a lighter overall structure.

However, with the shock and hardware the carbon frame weighs 3,180g – the previous frame was slightly lighter at 3,060g. (These are claimed weights in both cases). Trek puts that slight increase in weight down to the bigger shock, down tube storage and 34.9mm seat tube.

2021 Trek Slash models

Trek slash 7.

• Frame : Alpha Platinum Aluminium
• Fork : RockShox Yari RC
• Shock : RockShox Deluxe Select
• Drivetrain : SRAM NX Eagle, 11-50t
• Brakes : SRAM Guide T
• Price : £2,650 / €3,499 / $2,999

Trek Slash 8

• Fork : RockShox Lyrik RC
• Shock : RockShox Super Deluxe Ultimate, Thru shaft three-position damper
• Drivetrain : SRAM GX Eagle, 12-speed, 10-52t
• Brakes : SRAM Code R
• Price : £3,100 / €3,999 / $3,499

Trek Slash 9.7

• Frame : OCLV Mountain Carbon main frame and stays
• Fork : Fox Rhythm 36
• Shock : Fox DPX2, EVOL air spring, DPS damper
• Drivetrain : SRAM NX/GX Eagle, 12-speed, 10-52t
• Price : £5,250 / €4,799 / $5,999

Trek Slash 9.8 XT

• Fork : RockShox ZEB Select
• Drivetrain : Shimano XT M8100, 12-speed, 10-51t
• Brakes : Shimano SLX M7120
• Price : £5,250 / €5,999 / $5,999

Trek Slash 9.8 GX

• Brakes : SRAM G2 RSC
• Price : £5,800 / € 5,999 / $6,599

Trek Slash 9.9 XO1

• Fork : RockShox ZEB Ultimate
• Drivetrain : SRAM X01 Eagle, 12-speed, 10-52t
• Brakes : SRAM Code RSC
• Price : £7,500 / €7,999 / $8,499

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The New Trek Slash 9.9 Plows As Expected, But Pedals and Pops Too!

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I’m lucky to live in an area with delightfully steep and rough terrain. Because of that, long-travel bikes like Trek’s Slash are right up my alley. The 2024 Slash’s generation 6 frame is ready to get rowdy with a new high-pivot suspension linkage and 170mm travel. The bike simply plows through rough terrain, but remains impressively capable of getting itself back uphill for more laps.

The short story is I have nothing negative to say about Trek’s transition to the high-pivot suspension linkage. The new Slash is buttery smooth, yet offers a surprisingly poppy ride and still climbs as aggressively as their ABP bikes. The Slash is not the lightest bike, but that’s kinda fair since it’s such a beast.

2024 Trek Slash: Key Specs

For full details on the new Slash lineup, check out my launch article from September.  Before we get into the ride review, here are a few key specs and features of the 2024 Slash.

Most models of the Slash, including the 9.9 X0 AXS T-Type model I tested, come with full carbon frames. There are two aluminum complete models and an alloy frameset in the lineup. Of course, the biggest update for the Slash is the high-pivot linkage. The Slash now offers 170mm rear travel and all models come with 170mm forks.

Another interesting change for the new Slash is that they all come stock with a mixed-wheel setup (except small frames, which run dual 27.5” wheels). Frame sizes medium and up can run a 29” rear wheel, but you must buy the geo-correcting shock mounts from Trek. You’ll also have to remove the rear fender, as it doesn’t leave enough clearance for the 29” rear wheel.

The Slash boasts very slack and adjustable head tube angles, which can be altered by adding Trek’s angle adjust headset cups. Trek also incorporated their leverage rate chip into the shock mounts, offering ‘less’ and ‘more’ progressive settings. The Slash does not have Trek’s mino link anymore, as the other adjustments offer plenty of opportunity for fine tuning. Trek also decided to do away with their Knock Block headset.

A nice finishing touch for the carbon-framed Slash is Trek’s new ‘Carbon Armor’ frame protection. Before they’re painted, Trek wraps the frames with an impact-resistant film.

The Slash 9.9 X0 AXS T-Type (size M/L) weighs 35.76 lbs with pedals. Considering this is a beastly 170mm travel bike, and has extra hardware for its high pivot linkage, I guess I couldn’t hope for much better. I have to say though, with a full carbon frame, carbon rims and a lightweight carbon bar/stem combo, I was a bit surprised to see this high-end model come in over 35lbs.

Geometry/Fit:

At 5’10” and riding a M/L frame, I’m very happy with the Slash’s geometry. For this article, I’ll discuss the geo of my test bike, which has neutral headset cups and its stock mixed-wheel setup. Unfortunately, I didn’t have a compatible 29” rear wheel on hand to test.

So you know, the geometry remains very similar if you install a 29” rear wheel. Aside from the chainstay length growing by 6mm, there are very minor differences in certain angles and measurements. Check out Trek’s website to see all the different geo charts.

My test bike’s head tube angle is 63.3°, and I loved it. The slack steering angle tackles steep and rough terrain like a champ, but as I’ve found with slacker long-travel bikes it doesn’t hamper climbing ability by much. I’m not sure if I would go any slacker for trail riding, but if I set up a Slash for bike park shredding I’d be tempted to try the slacker headset cups. At 63.3° the Slash offers a ton of stability and feels great on steep downhills, yet the bike still doesn’t feel overly long or clumsy on tight switchbacks.

Helping get you uphill is a steep effective seat mast angle of 77.3°. With a lengthy reach of 468.1mm, that steep seat tube leans you into a well-balanced position over the bike. This is one of the longer bikes I’ve ridden, but I never felt like my arms were overextended.

With Trek’s size-specific chainstays, the M/L mixed-wheel Slash’s rear end measures 434.2mm. This middle-of-the-road length, especially with the 27.5” rear wheel, keeps the Slash pleasantly agile. Overall the bike feels long and very stable at speed, but the rear end simply whips around corners. I should note this is the first MX bike I’ve ridden, and I quickly understood why people like them. I’ve never been amazing at cornering, but I felt like I suddenly got better when I hopped on this bike!

Looking at the numbers, the Slash isn’t the lowest bike out there. The standover height is not particularly low at 766mm, and neither is the BB height of 351mm. Up front the stack height is 632.1mm. I don’t remember banging pedals or the 165mm cranks very much, so the BB height allows decent clearance on the trail. It’s higher than some competitors, but the Slash’s long wheelbase and slack steering still provide a very stable ride.

On my first ride with the Slash, I did notice the slightly sluggish roll of the 27.5” rear wheel. I had been riding niners for a few weeks before the Slash arrived, and I have to admit I felt the difference right away.

That said, I quickly forgot about the smaller rear wheel and adapted to the Slash’s ride. While I’ll never say it’s the best climber I’ve ridden, it does very well for how burly a bike it is. Shedding some weight and running 29” wheels would make it climb better, but that’s not what the Slash is all about. Trek describes this bike as ‘70% downhill, 30% uphill’ but I’d say it climbs a little better than that suggests. 

I’ve always found Trek’s ABP linkage to climb aggressively and powerfully, and the new high-pivot version doesn’t behave too differently. Trek tuned the new Slash’s anti-squat to be pretty close to their Top Fuel XC/trail bike, so your pedalling inputs won’t force you deep into the Slash’s lengthy travel.

Climbing singletrack with the shock in firm, I’d get about 50% travel. In open mode, the shock would dip a bit further but top out around 60-65%. I’ll take the slightly rougher ride and increased pedal support from the shock’s firm mode, because in either setting I had solid traction on any singletrack climb. In firm mode the Slash doesn’t erase small bumps; you still feel the trail below you with the shock resisting those low-speed impacts.

In open mode, the shock helps soften those small bumps and offers a more comfortable ride. Fortunately, there is little sacrifice in pedalling efficiency when the shock is left open, so riders looking for maximum traction can opt to climb this long-travel machine wide open with practically no penalty.  

With the rear shock left wide open, I tried some hard pedaling and sprinting on paved roads to see what the Slash’s high-pivot linkage would do. Sitting down and mashing the pedals as best I could, I could not get the bike beyond 40% travel (from 30% sag). Even standing up and sprinting, I only made it a bit further than 40%. It’s clear that Trek’s linkage handles pedaling forces very well. The bike was in its ‘more’ progressive position for this test, but I don’t think it would behave much differently in the ‘less’ setting so early in the travel.

It’s always nice when a bike has no unusual setup requirements. With the Slash, I pumped the shock up to body weight in psi, set rebound/compression to my usual ranges, and the bike was dialed. Right away I was getting full travel from the rear shock (with the leverage chip in ‘less’ position), which is sometimes an issue for my 145lbs self.

Descending:

I’ve always found Trek’s MTBs to be great at gobbling up bumps, but the high-pivot Slash is even better. I noticed it does particularly well at eating up mid-sized bumps, happily plowing through roots and rocks. The rearward axle path does a great job of numbing bigger hits and keeping the Slash feeling planted on rough trails. I found the bike cushions landings very well, especially on little jumps that send you right onto a rocky or rooty patch. 

It’s hard to pinpoint a weak spot in the Slash’s suspension. At higher speeds, the bike smooths out small bump chatter very well, and as noted above it rounds off medium and big hits nicely.

Furthermore, with all that squish when you want it, the Slash actually seems to pop off jumps a bit better than the 2019 Remedy I owned for several years. It also springs out of corners surprisingly well, as I’ve traditionally found Treks to be a better example of plowy than lively and poppy. It seems the big Slash has maintained an impressive degree of mid-stroke support.

Just looking at this frame, you’d probably expect it to be stiff and you’d be correct. Just like the previous generation Slash and Fuel EX I rode, I found the 2024 Slash’s frame offers a solid, commanding feel as you charge down rough trails.

For most of my rides, I had the leverage chip in its ‘less’ setting, but I flipped it to ‘more’ for my last few test laps. Interestingly, the ‘more’ setting doesn’t seem to increase bottom-out resistance by much; I hit full travel on a typical trail loop in the first ride in this setting.

What I found is the rear wheel does feel like it’s resisting bigger, sharper hits more. Under my lightweight self, the Slash felt a bit less plowy and the back wheel would bounce a bit more facing sharp impacts. The only time I got a good ‘thunk’ out of this bike’s rear end was while riding in the ‘more’ position. For me, there’s no question I’d keep the Slash in its ‘less’ setting. The biggest joy of this bike is how capably it sucks up rough terrain, and I’ll take all the squish it has to offer.

The Slash’s 27.5” rear wheel offers good clearance. I rode the steepest trail in my local network and didn’t hit my ass on the tire once (and I have on my personal 29er)! As mentioned above, the mullet setup also has an immediately noticeable benefit in the corners. After you initiate a turn, you then feel the back end hook in and bring you around quicker than a 29er would.

Chain Drop?

Some of you may have seen reports of the new Slash dropping chains. Apparently, some of the bikes were sent out with the lower chain guides incorrectly installed, and some riders had issues with chain drop. After many rides on my test bike, I got the notice from Trek and found out it was indeed not to spec… however I never dropped a chain.

By the time I got the info on how to correct the situation, winter had set in and my testing was pretty much done. I rode the bike two or three more times without even adjusting the chain guide, and still never once lost my chain.

To fix this issue Trek is making sure all Slashes will now be shipped out with the correct setup. They’ve also notified dealers on how to fix the issue, and as an extra precaution, they’re supplying upper idler pulleys with longer teeth to dealers at no charge. As of early 2024, anyone with a new Slash can go to their local shop and have the revised idler installed.

If you’re wondering about potentially increased drag with the high-pivot chain line, I can’t say I noticed anything measurable. Of course, this is a brand new bike; over time the upper pulley might produce extra drag if the bearing wears out, but with all new components the Slash pedalled like any other MTB.

Components:

A RockShox Zeb fork was the obvious choice for the burly new Slash. The 9.9 X0 AXS T-Type bike I rode gets the Ultimate model with a DebonAir spring and Charger 3 RC2 damper. The fork is stiff, offers great initial sensitivity, and sucks up bigger hits in class-leading fashion.

Out back, RockShox’s Vivid Ultimate rear shock performed great with very little fidgeting. The stock tune feels pretty linear which works well for a smaller guy like me, allowing full squish on nearly any descent. The shock’s firm mode resists low-speed impacts nicely, but doesn’t ride like you’re at near-lockout firmness.   

Overall I had great performance from the SRAM X0 Eagle AXS T-Type drivetrain and dropper post. However, the dropper post suddenly stopped working in the middle of my third ride. Once I got home I simply paired up the post and control pod, and since then everything has worked perfectly. 

The 30t chainring and 10-52t cassette provide a vast gear range for trail riding, and shifting performance was basically flawless throughout my test. I unfortunately gave the T-Type X0 derailleur’s cage a good smash and a nasty bend, but didn’t notice right away because gear shifting was still fine! The derailleur will skip lightly when backpedaling but it still doesn’t derail at all, which is impressive.

Bontrager’s Line Pro 30 carbon wheels held up great through my test, showing no signs of damage or warpage. The Slash’s wheels come tubeless with a Bontrager SE6 Team Issue 29×2.5” front tire and a Team Issue SE5 27.5×2.5” rear tire. These tires offer a well-rounded tread that rolls fairly fast and provides good grip on all surfaces. 

Bontrager’s RSL carbon bar/stem combo is hard not to enjoy looking at! The rise is 27.5mm, stem length is 35mm, and the bars come stock at 820mm wide . The 7° backsweep and 6° upsweep is a bit more up and less back than most bars I’ve ridden, but I found them comfortable. I would have liked to ride the full width, but my bars had been cut to 795mm. I rode these bars uncut on the previous generation Slash and was surprised how much I liked them.

SRAM’s Code Silver 4-piston brakes with 200mm rotors had no shortage of power, reeling in this big bike with great modulation and more than ample bite force.

The 170mm dropper post on the M/L frame gets low and out of the way. I didn’t have any problems riding with the Bontrager Arvada saddle, but I find it a bit hard and not the most comfortable. 

The Slash’s rear fender seems to work fairly well. After a wet, snowy ride I still had mud spray all the way up the back of my jacket, but less than what I expected. I also noticed the back of the dropper post and under the saddle weren’t that dirty.

Trek’s Carbon Armor seems to help resist frame damage well. After close inspection, I could only find a few very minor knicks or scratches on the Slash. The down tube, BB shell and all the areas prone to rock strikes from the rear wheel remain basically unscathed. 

Frame Storage:

Trek’s in-frame storage was revised for the Slash, offering a larger door and an updated latch. The storage compartment is easy to open and close, and the included Bontrager BITS tool roll has spots for a CO2 canister, an inflator head, a multi-tool, and a tube (although it’ll have to be a thin one). Trek added ‘chunnels’ inside the Slash’s frame to keep your tool roll/cargo from snagging on your cables. They seemed to work well, I had no issues with anything snagging inside the frame.

Bontrager’s BITS steerer tube multi-tool is also included on all Slash 9.9 models – a nice finishing touch for these top-tier builds! 

The 2024 Trek Slash 9.9 X0 AXS T-Type retails for $9399. Frame color options are Daintree, Lichen Green (as tested), or Argent Drizzle.

trekbikes.com

Steve Fisher is a staff contributor for Bikerumor. Steve has been writing about trail, enduro and downhill mountain biking (plus a few commuter bikes) for seven years. Prior to that, Steve wrote for Whistler Traveller Magazine and Mountain Life Magazine. Steve is based in Pemberton, British Columbia, an area that offers plenty of challenging world-class singletrack and makes for great photos!

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Trek Slash 8 review – The return of the champion

The Trek Slash 8 took top honours in last year’s affordable enduro bike group test. Rather than retire quietly, the Slash 8 has dusted off it’s championship belt and is back in the ring again. But, one year on, can the middle-weight still go 12 rounds with the big-hitters?

The Trek Slash 8 in detail

In 1981, Bill Gates supposedly once made the statement “640K ought to be enough for anybody.” Today, the latest iPhone 11 has nearly 10,000 times that capacity in its RAM. The same goes for bikes. When Trek launched the Slash back in 2016, with an (at the time) massive 160 / 150 mm of travel (for a 29er), we were blown away. It was a monster. Times have changed and in this test the Trek Slash 8 looks a little undergunned. However, there is life in the old dog yet and the Trek isn’t quite ready for retirement. After winning our test last year, we thought we would bring the Trek back for another round to see if it can hold onto its title. The carbon Slash was arguably the bike that started the long travel 29er movement, but it was the affordable aluminium version that attracted the masses with more aggressive geometry (8 mm longer reach and 0.8° steeper seat tube angle) and attractive € 2,999 price point. The Slash 8 features a 160 mm RockShox Yari RC fork and RockShox Deluxe RT3 RE:aktiv shock with Trek’s proprietary Thru Shaft technology. A SRAM GX Eagle drivetrain does the shifting, while SRAM Guide R brakes with 200/180 mm rotors reign in the fun (in more ways than one). The rest of the cockpit comes from Trek’s own Bontrager brand, as are the 150 mm dropper post and XR4 tires.

Trek Slash 8 29

Specifications.

Fork RockShox Yari R 160 mm Rear Shock RockShox Deluxe RT3 RE:aktiv Thru Shaft 150 mm Seatpost Bontrager Line 150 mm Brakes SRAM Guide R 200/180 mm Drivetrain SRAM GX Eagle 1x12 Stem Bontrager Line Knock Block 50 mm Handlebar Bontrager XR Elite 780 mm Wheelset Bontrager Line Comp 29" Tires Bontrager XR4 Team Issue 2.4"/2.4"

Technical Data

Size S M ML L XL Weight 14.4 kg

Specific Features

The geometry of the Trek Slash 8

The Trek comes with the geometry adjusting Mino Link, allowing you to swap between a steep and slack setting. As with most flip chips, we put the bike in the slack setting and left it there. Compared to the rest of the bikes in this test field, the Trek is the most conservative, with a short 453 mm reach in size Large, 1219 mm wheelbase and short 434 mm chainstays. The 65.1° head angle and slack 74.4° seat angle will disappoint those looking for radical geometry. The geometry is finished with a 621 mm stack and 28 mm bottom bracket drop.

Nimble, direct and balanced, we loved the way the Trek can skip from line to line as if it weighs 2kg less.

Refined and playful, the Trek Slash 8 on the trail

You can feel the heritage of the Trek Slash 8 as soon as you throw a leg over it. The position is familiar and easy going and while the short front triangle appears compact, the slacker seat tube angle ensures that you have plenty of room. Running the saddle fully forwards on the rails to steepen the seat tube for the climbs does bring you quite close to the bars for a head up and tall riding position. At 14.4kg, it’s the lightest bike in the test, and with the fast rolling Bontrager XR4 tires, it feels significantly more sprightly uphill than its competitors. Here it handles more like a long legged trail bike than an enduro bike. The Trek finds lots of traction if you take on the challenge of a technical uphill section and the compact dimensions help keep the front wheel tracking accurately. Anti-squat is moderate, so we found we were reaching for the climb switch of the RockShox Deluxe RT3 RE:aktiv shock to control pedal bob on long fire-road climbs in the bigger gears. Nonetheless, overall the Trek was the most pedal friendly of all the bikes on test.

Downhill, the Trek is a masterclass in poise and balance. It feels noticeably more nimble than the other bikes in this test, hitting lines accurately and skipping into the air with the gentlest pull on the bars. The moderately progressive suspension with its unique ABP design remains very active, even under hard braking, giving you more confidence to charge into sections knowing that you can scrub speed without losing your suspension. It’s best not to get too carried away though as the weedy SRAM Guide R brakes are a trail bike brake at best. The Trek Slash is best ridden differently from the other bikes in this test, connecting gaps and pumping between the best lines, rather than ploughing straight through. When the going gets really tough, the suspension starts running out of travel and just like the Merida ONE-SIXTY the Yari RC starts to struggle, packing down into its travel. The Bontrager XR4 tires offer good grip but lack an aggressive shoulder tread for wet conditions. Overall, one year on, we are still really impressed with the Trek Slash 8. It could be the perfect ‘bridge’ bike for the rider who thinks that they would be best on a trail bike but love the occasional DH track, grassroots enduro race or week in the Alps.

How does the Trek Slash 8 Compare to the other bikes in this test?

The Trek Slash’s nearest rival is the Propain Tyee CF. Both bikes share a nimbleness not shown by any other bike in this test, skipping into the air at every opportunity. The Trek is the more agile bike, pumping for speed and popping shapes, but the Propain Tyee is a more efficient climber and the better fork and longer travel allow the Propain to pull ahead when the trails get really rowdy.

Tuning tips: you may need to change the Bontrager XR4 tires if you ride in the wet | add tokens to the Yari to improve support | upgrade brakes to SRAM CODEs or Guide REs

Riding Characteristics

Value for money, intended use.

Returning as the reigning champion, the Trek Slash 8 proved it’s not ready for retirement just yet. If you’re looking for a versatile enduro bike that can still masquerade as a nimble trail bike, the Trek Slash 8 would be our pick of the bunch. Its balanced handling and nimble nature is easy to enjoy whatever your skill level. Only on the roughest trails does it start to lose its cool.

• loves to play with the trail
• ABP suspension works flawlessly under hard braking
• versatile and nimble

• disappointing brakes
• Yari fork gets overwhelmed in rough terrain

For more info head to: trekbikes.com

The test field

For an overview of the test fleet head to the group test: What’s the best 2020 Enduro Bike under € 3,500 – 9 mountain bikes in review

All bikes in test: Canyon Torque AL 6.0 (Click for review) | GIANT Reign SX 29 (Click for review) | Ibis Ripmo AF Coil (Click for review) | MERIDA ONE-SIXTY 700 (Click for review) | Nukeproof Mega 290 Expert (Click for review) | Privateer 161 (Click for review) | Propain Tyee CF (Click for review) | Trek Slash 8 29 | YT Capra Comp 29 (Click for review)

This scale indicates how efficiently the bike climbs. It refers to both simple and technical climbs. Along with the suspension, the riding position and the weight of the bike all play a crucial role. ↩

How does the bike ride and descend? How spritely is the bike, how agile is it through corners, how much fun is it in tight sections and how quickly can it change direction? ↩

Is the bike stable at high speeds? Is it easy to stay in control in demanding terrain? How composed is it on rough trails? Stability is a combination of balanced geometry, good suspension and the right spec. ↩

This is all about how balanced the bike is and particularly about how well it corners. Balanced bikes require little physical effort from the rider and are very predictable. If a bike is unbalanced, the rider has to work hard to weight the front wheel to generate enough grip. However, experienced riders can have a lot of fun even with unbalanced bikes. ↩

How sensitive is the suspension over small bumps? Can it absorb hard impacts and does it soak up repeated hits? Plush suspension not only provides comfort and makes a bike more capable, but it also generates traction. The rating includes the fork and the rear suspension. ↩

This aspect mainly comes down to the suspension. How much pop does it have, does it suck up the rider’s input or is it supportive, and how agile and direct is the bike? ↩

We don’t calculate value for money in an excel spreadsheet or based on how high-end a bike is specced. We are more concerned with how a bike performs on the trail and how the bike benefits the rider. What good are the best components if the bike doesn’t perform well on the trail? Expensive bikes with a lower-end spec can offer very good value for money – provided they excel where it matters. Just as supposedly cheap bikes with good components can get a bad rating if they don’t deliver on the trail. ↩

No, it’s not about racing, it’s about efficiency. Fast, fleet-footed and efficient – those who want to speed along flowy singletrack and gravel roads need a defined and spritely bike that accelerates with ease and efficiency. Nevertheless, reliable components are important too. We interpret XC more like the Americans do: big back-country rides instead of a marathon or XC World Cup with the ultimate in lightweight construction! Uphill-downhill ratio: 80:30 (not everything has to be 100%!) ↩

...also known as mountain biking. Classic singletrack with roots, rocks and ledges – sometimes flowy, sometimes rough. For this, you need a bike with good all-round qualities, whether climbing or descending. Uphill-downhill ratio: 50:50 ↩

Even more extreme and challenging compared to Trail riding, riddled with every kind of obstacle: jumps, gaps, nasty rock gardens, ruts and roots. For this, you need (race)proven equipment that forgives mistakes and wouldn’t look out of place on a stage of the Enduro World Series. Climbing is just a means to an end. Uphill-downhill ratio: 30:70 ↩

Strictly speaking, a 200 mm travel downhill bike is the best choice for merciless tracks with big jumps, drops and the roughest terrain. Those would be the black or double-black-diamond tracks in a bike park. But as some of the EWS pros (including Sam Hill) have proven, it’s the riding skills and not the bike that define what you can ride with it. Climbing? On foot or with a shuttle, please! Uphill-downhill ratio: 10:90 ↩

You can find more info about our rating system in this article: Click here! ↩

Did you enjoy this article? If so, we would be stoked if you decide to support us with a monthly contribution. By becoming a supporter of ENDURO, you will help secure a sustainable future for high-quality mountain bike journalism. Click here to learn more .

Words: Photos: Trev Worsey, Finlay Anderson

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First Look: 2018 Trek Slash 9.7

by Wil Barrett November 21, 2017 0

Long travel 29ers are quite the thing at the moment aren’t they?

Thanks to some key success on both the Enduro World Series and in the Downhill World Cup, big wheelers are clearly hot property right now. Of course many of us have long known the benefits of 29in wheels, but due to them having originally been marketed towards the spandex-wearing, XC racing set, it’s taken some time for that perception to change. Modern geometry has certainly helped, as have advancements in 29in suspension and wheel technology, which have all paved the way for some very good mountain bikes that just so happen to be rolling on wagon wheels. For a look at three excellent examples, check out our recent Modern Geometry 29er Group Test feature .

Trek Bikes has been riding the 29er wave thanks to Gary Fisher’s assistance, and the Slash is the brand’s latest offering that’s designed to be a purpose-built enduro race machine. First unveiled in 29er form in June of last year (remember that super-hot firetruck red launch model? ), the Slash range has expanded for 2018, and is now available in 9.9, 9.8 and 9.7 models. Here we take you through the entry-point into the range; the Slash 9.7, which James Vincent will be punishing on some burly Cumbrian singletrack to see how it handles.

“ Slash is designed from the ground up to conquer the gnarliest enduros, in a 29″-optimised package that makes this bike the undisputed king of the mountain. Slash is built to dominate the most demanding mountain and ride with big 29″ wheels on an aggressively capable yet lightweight carbon frame. Throw Slash down the most technical descent and fly back up. ” – From Trek Bikes.

Trek Slash 9.7 Features

• Long travel 29er enduro bike
• OCLV Mountain carbon fibre mainframe with alloy stays
• Knock Block headset
• ABP suspension design
• Custom RockShox Deluxe RT3 Thru Shaft shock with RE:aktiv damper
• 150mm rear travel
• Designed for 160mm travel forks
• 65.6° head angle
• 74.1° seat tube angle
• 433mm chainstay length
• BB92 bottom bracket shell
• ISCG 05 chainguide tabs
• Mino Link adjustable geometry
• Boost 148x12mm thru-axle
• Available sizes: Small, Medium, Large, & X-Large

In terms of travel and intent, the Slash kind of takes off where the old Remedy 29er (forever rest in peace) left off. The Slash steps things up with 150mm of rear travel, a 160mm travel fork, and a new frame design that puts an emphasis on strength and rigidity with its straight down tube and single pivot suspension design.

As with all Slash models, the mainframe is made from OCLV Mountain carbon fibre, though to bring the price down, the Slash 9.7 uses an alloy sub frame. Along with a carefully chosen build kit, Trek has been able to bring the Slash RRP down below £4k, while still rolling with a 1×11 drivetrain, a RockShox Yari fork and the new Thru Shaft rear shock technology.

So what do you folks think of the 2018 Trek Slash? Are you digging what this long travel 29er is laying down? Or are you more of a 27.5 Remedy person? Let us know what you reckon in the comments section below!

For further information on the 2018 Slash models, head to the Trek website . Otherwise, hold tight for James’ full review of the Slash 9.7 as he tries to find its limits on and off the racetrack.

2018 Trek Slash 9.7 Specifications

• Frame //  OCLV Mountain Carbon Fibre Mainframe w/Alloy Stays, 150mm Travel
• Fork //  RockShox Yari RC, G2 Geometry, 160mm Travel
• Shock //  RockShox Deluxe RT3, RE:aktiv with Thru Shaft, Trunnion Mount
• Hubs //  Bontrager Line Comp 30, 110x15mm Front & 148x12mm Rear
• Rims // Bontrager Line Comp 30, 29mm Internal Rim Width, 28h, Tubeless Ready
• Tyres //  Bontrager SE4 Team Issue 29×2.4in Front & Rear
• Chainset // SRAM Descendant 6k Eagle, 32T Direct Mount X-Sync 2 Chainring
• Rear Mech //  SRAM NX, 11-Speed
• Shifter //  SRAM NX, 11-Speed
• Cassette // SRAM PG-1130, 11-42t, 11-speed
• Brakes //  SRAM Guide R, 180mm Front & Rear
• Stem //  Bontrager Line, Knock Block, 35mm Diameter, 50mm Long
• Bars //  Bontrager Line, 35mm Diameter, 27.5mm Rise, 780mm Wide
• Grips //  Bontrager Rhythm Dual Lock-On
• Seatpost //  Bontrager Drop Line, 31.6mm Diameter, 100mm Travel (15.5in), 125mm Travel (17.5in & 18.5in), 150mm Travel (19.5in & 21.5in)
• Saddle //  Bontrager Evoke 2, Cromoly Rails
• Size  Tested  //  19.5in
• Sizes available //  15.5in, 17.5in, 18.5in, 19.5in and 21.5in
• RRP //  £3800

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2018 Trek Slash 9.7

A 29″ carbon frame full suspension enduro bike with upper mid-range components. Compare the full range

For This Bike

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Based on frame geometry and build specs.

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

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Jun 2019 · Steve Solt

This 150/160mm aluminum 29er features trail handling and enduro travel.

Read Review

May 2019 · McCoy

Economy-class enduro

Jul 2018 · Christoph Bayer

The Trek Slash already secured the best in test in one of our earlier group tests. At the time we were testing the more expensive model, however. With the lower entry Slash 9.7, you get the same high-end carbon frame, but you have to accept significant reductions in the spec – how big of a […]

Trek takes its flagship long-travel Slash and makes it more affordable

Like it or not punks, big wheeling is what’s hot right now! We have been lucky enough to have our hands on a number of new pushys, including a brand-new 2018 Trek Slash 9.7 for review. With a huge season within the world of downhill and Enduro both domestically and internationally, you cannot deny 29’ inch wheels are making their mark on disciplines of MTB that years ago we would’ve thought may have stayed committed to the traditional 26’ inch […]

Mar 2018 · Bturman jeff.brines

The Slash set the new benchmark for long-travel 29ers not long ago, and 2018's version attempts to meet the same standard. This one is stiff, light, and an excellent option for long adventures.

Feb 2018 · James Vincent

If you get your kicks from heading downhill over rough terrain as quickly as possible, then the Trek Slash simply has to be at the top of your shopping list.

Jan 2018 · Ieuan Williams

Our former benchmark 29er under scrutiny

Last updated 15 February Not listed for 2,235 days

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Trek Slash 9.7 Mountain Bike 2021

With a lightweight but super-strong carbon fibre frame and superbly specced full-suspension system, the Trek Slash 9.7 29" Mountain Bike is one of Trek's finest. For riders who want to feel planted while riding the toughest trails at speed, the suspension system has been prioritised to deliver. A 170mm FOX Rhythm 36 Float EVOL fork pairs wonderfully with the FOX DPX2 rear shock and its 160mm of travel for a really balanced performance.

Trek's attention to detail is what puts them at the top of the game in so many riders' eyes. The Knock Block headset limits the risk of damage to your top tube or controls in a crash, and for more control while braking, the Active Braking Pivot separates the suspension from braking forces to improve traction. Don't worry about riding your carbon frame over loose rocky sections, with the replaceable down tube guards doing a great job of protecting your frame in case of rock strikes.

The mix of SRAM GX and NX Eagle components make a quality gearset that shifts instantly, and the Code R hydraulic disc brakes are excellent too. The Bontrager Line comp 30 wheels come with a tubeless-ready kit so you can make the most of them right away.

• Full OCLV Mountain Carbon frame with Mino Link adjustable geometry
• 170mm FOX Rhythm 36 Float EVOL fork with GRIP damper
• 160mm of rear travel with a FOX DPX2 shock that offers loads of adjustability and tuning options
• You’ll fade before the FOX DPX2 shock does – it's built to help you squeeze the most out of long, gnarly descents
• Removable Knock Block has a bigger steering angle to keep cables and hoses safe without sacrificing turning radius
• A sleek internal storage compartment gives you a versatile spot to stow tools and gear
• Trek added a second down tube guard to better protect your frame from shuttle-related damage
• Wider seat tube, wider dropper – the 34.9mm diameter post is stronger, more durable, and moves up and down faster

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