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Trek Marlin 4 Gen 2 Review: A Capable Budget-Friendly XC MTB

Trek Marlin 4 is the second cheapest model in Trek’s mountain bike range, at just $630. 

This stylish, modern-looking hardtail is a solid introductory bike for day-to-day riding, commuting, and leisurely weekend spins on gravel and dirt trails. 

Although it looks the part, the Marlin 4 can’t handle actual mountain trails, as the low-performance fork won’t take much abuse. 

This Trek Marlin 4 review will provide a detailed look at the bike, its strengths and weaknesses, and the type of rider who should buy it. 

What Is the Weight Limit on a Trek Marlin 4?

The weight limit on a Marlin 4 MTB is 300 lbs, which includes the bicycle, rider, and cargo. The bike weighs just under 32 lbs, leaving around 268 lbs for the rider and cargo. 

• Sleek design with internal cable routing
• Shimano drivetrain
• Cheap 
• Heavy, low-performance fork

Trek Marlin 4 2023 Full Specs

Trek marlin 4 gen 2 full review.

The Trek Marlin 4 2022 is the same as the 2023 model. It has a basic 3×7-speed Shimano Altus/Tourney groupset and Tektro mechanical disc brakes, a typical pairing for the price range. The SR Suntour XCE 28 isn’t worth much on mountain trails but takes the sting out of bumpy gravel trails and roads. 

This section will cover the features and components that make the bike stand out in its price category. 

Is the Trek Marlin 4 a Trail Bike?

The Trek Marlin 4 is not a trail bike. Trail mountain bikes typically have above 120mm of travel, and the majority of models are full-suspension. Instead, the Marlin 4 is a light-duty off-roader better suited to urban riding and gravel trails.

If you want a proper trial bike, check our list of the best full-suspension mountain bikes out there.

Stylish Alpha Silver Aluminum Frame

The whole Trek Marlin series uses the same Alpha Silver aluminum frame. However, at less than half the price of the premium model, this frame is a notable strength of the Marlin 4. 

Marlin 4 has full internal cable routing, which is a popular feature that not all mountain bikes in this price range offer.

Trek’s Alpha Silver frame comes from years of materials innovations and design expertise, resulting in a balanced ride quality that balances stiffness and compliance compared to the overly stiff aluminum frames typical of this price range. 

This frame also has sleek internal cable routing that gives the bike a higher-priced finish and mounts for a rack and kickstand for commuting or even light bikepacking. 

What Is the Difference Between Trek Marlin 4 and 5?

There isn’t a big difference between the performance of the Trek Marlin 4 vs. 5. The Marlin 5 has a slightly more robust fork, improved 2×8-speed gearing and hydraulic disc brakes, and a slightly lower weight. However, the Trek Marlin 4’s price is $110 lower than the Marlin 5 . 

Progressive Sizing

The Trek Marlin 4 2023 comes in seven different sizes, with almost two feet in between the shortest and tallest recommended heights. The company uses progressively sized wheels and components and a modified top tube for the smaller bikes to deliver the same performance for each rider . 

The XS and Small sizes both have a curved top tube which lowers the standover height, which shorter riders have issues with, and ‘Smart Wheel Sizes’ means the smaller sizes get 27.5″ wheels instead of 29ers. In addition, the brake levers, handlebars, stems, and cranks all change throughout the size range. 

Reliable Bontrager Componentry 

Trek Bikes’ in-house brand Bontrager provides the whole build kit aside from the groupset and fork. These are well-made components that will stand the test of time. In addition, they are easy to replace by visiting the Trek online store. 

Premium all-black finish and quality Bontrager parts help Trek Marlin 4 look good and provide better value for the money.

It’s worth noting that the saddle, handlebars, seatpost, and stem are the same across the five Marlin bikes, which benefits the Marlin 4 and increases its value as it is the cheapest. 

Trek Marlin 4 Gen 2 Sizing Chart

• XS — 4’9″-5’1″ / 145-155cm
• S —  5’1″-5’5″ / 155-165cm
• M —  5’5″-5’8″ / 165-173cm
• M/L — 5’8″-5’11” / 173-180cm
• L —  5’11”-6’2″ / 180-188cm
• XL —  6’2″-6’5″ / 188-195cm
• 2XL — 6’5″-6’8″ / 195-203cm

Who Is Trek Marlin 4 Gen 2 Best Suited For?

The Trek Marlin 4 mountain bike is suitable for urban riders, commuters, and anyone who enjoys riding on light off-road paths, fire roads, and gravel trails. 

By equipping Trek Marlin 4 with a rear rack and kickstand, you can use it for commuting, running errands, or even bikepacking.

The level of components is typical for this price point, and they perform as expected. However, there are clear limitations to this bike’s capabilities off-road. So if you’re looking for a capable XC mountain bike, this isn’t it. 

Anyone looking for a cheap, reliable run around that doesn’t sacrifice style will appreciate the Trek’s Marlin 4. 

Other Trek Marlin Bikes We Reviewed:

• Trek Marlin 5 Gen 2 Review
• Trek Marlin 6 Gen 2 Review
• Trek Marlin 7 Gen 2 Review
• Trek Marlin 8 Gen 2 Review

Is Marlin 4 Gen 2 a Good Buy?

We believe the Trek Marlin 4 Gen 2 is an excellent buy in the ~$600 price range, easily competing with similarly-priced hardtails like the Cannondale Trail 8 or Co-op Cycles DRT 1.0. 

Trek bikes are renowned for their reliability, and with the Marlin 4, you’re getting this reliability at an unbeatable price. And if that wasn’t enough, it’s got a sleek modern design that makes it look more expensive than it is. 

Consider the Marlin 4 if you want a Trek mountain bike that doesn’t break the bank and will get you from A to B in comfort and style.  

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Trek Marlin 4 Gen 2

Marlin 4 is the perfect gateway to trail riding. It's ideal for new riders who want a mountain bike with knobby tires that can double as a rugged commuter. Disc brakes, front suspension, 21 speeds, and mounts for a rack and fenders make this a great bike for new trail riders and campus commuters alike. It's right for you if... You want an introductory mountain bike at an incredible price but also want a commuter that's rugged enough to hop curbs on the way to class. The tech you get A lightweight aluminum frame with internal routing to protect your cables and add to the bike's sleek look, 21 speeds, a wide range of gearing so you always have the right gear for your terrain, powerful mechanical disc brakes, and a suspension fork that takes the edge off bumps and rough terrain. The final word Marlin is made for any adventure. The rack and fender mounts make it a great choice for commuters who want to get a little rad on the way to class or the grocery store. Why you'll love it - It's a real mountain bike that's also perfectly suited to daily commutes, rides around campus, or just getting from A to B on any surface - Rack and fender mounts make it easy to accessorize, so your mountain bike can double as a rugged commuter - Smaller frame sizes (XS and S) have short-reach brake levers that make it easier and more comfortable for riders with smaller hands to brake confidently - Marlin models in XS and S frame sizes have a curved top tube and a lower standover height that makes it easier for smaller riders to mount and dismount - Like every model in the Marlin family, it's backed by Trek's lifetime warranty Wheel size: - Sizes X-Small – Small: 27.5-inch - Sizes Medium – XX-Large: 29-inch

Will my bike have a curved top tube?

Smaller frames (XXS-S) have a top tube that dips down as it approaches the seat tube. This design makes for a lower standover height, which is good for shorter riders because it allows them to straddle their bike more easily. The larger frames (M and up) have a straight top tube because taller riders with longer legs typically don’t have the same issues with standover height.

Due to supply-chain issues, Specs are subject to change without notice.

* Subject to change without notice.

Part Numbers

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• Marlin 4 Gen 2

Trek Marlin 4 Gen 2 - 2023

Marlin 4 is the perfect gateway to trail riding. It's ideal for new riders who want a mountain bike with knobby tires that can double as a rugged commuter. Disc brakes, front suspension, 21 speeds, and mounts for a rack and fenders make this a great bike for new trail riders and campus commuters alike. It's right for you if... You want an introductory mountain bike at an incredible price but also want a commuter that's rugged enough to hop curbs on the way to class. The tech you get A lightweight aluminum frame with internal routing to protect your cables and add to the bike's sleek look, 21 speeds, a wide range of gearing so you always have the right gear for your terrain, powerful mechanical disc brakes, and a suspension fork that takes the edge off bumps and rough terrain. The final word Marlin is made for any adventure. The rack and fender mounts make it a great choice for commuters who want to get a little rad on the way to class or the grocery store. Why you'll love it - It's a real mountain bike that's also perfectly suited to daily commutes, rides around campus, or just getting from A to B on any surface - Rack and fender mounts make it easy to accessorize, so your mountain bike can double as a rugged commuter - Smaller frame sizes (XS and S) have short-reach brake levers that make it easier and more comfortable for riders with smaller hands to brake confidently - Marlin models in XS and S frame sizes have a curved top tube and a lower standover height that makes it easier for smaller riders to mount and dismount - Like every model in the Marlin family, it's backed by Trek's lifetime warranty Wheel size: - Sizes X-Small – Small: 27.5-inch - Sizes Medium – XX-Large: 29-inch

Will my bike have a curved top tube?

Smaller frames (XXS-S) have a top tube that dips down as it approaches the seat tube. This design makes for a lower standover height, which is good for shorter riders because it allows them to straddle their bike more easily. The larger frames (M and up) have a straight top tube because taller riders with longer legs typically don’t have the same issues with standover height.

Due to supply-chain issues, Specs are subject to change without notice.

* Subject to change without notice.

Part Numbers

• Marlin 4 Gen 2

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All bikes ordered online ship for free to your local Trek shop for professional assembly. Participating retailers will even deliver your new ride to your doorstep!

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If for any reason you aren't 100% happy with your trekbikes.com purchase, you can return it in like new condition within 30 days - no questions asked.

Which generation is right for you? 

Snag Marlin Gen 3 for the trail-taming geometry and features or opt for Marlin Gen 2 for a classic XC ride at a more pocket-friendly price.

Load up. Or not.

Whether you're after a lightweight singletrack shredder or sticking to the pavement on your commute to work, Marlin is compatible with all the gear you need to have a great ride.

5 things to do before every mountain bike ride

Do this quick pre-ride safety check before you hit the trails.

Product features

Will my bike have a curved top tube.

Smaller frames have a top tube that dips down as it approaches the seat tube. This design makes for a lower standover height, which is good for shorter riders because it allows them to straddle their bike more easily. Larger frame sizes have a straight top tube because taller riders with longer legs typically don’t have the same issues with standover height.

Fit for every rider

Marlin comes in seven frame sizes to suit riders of any height, and Smart Wheel Size ensures you’re on the fastest wheel that fits. The smallest sizes even come with short-reach brake levers and narrower handlebars that give smaller riders better comfort and control.

High tech, high value

Marlin looks and feels great. It’s packed with features usually found only on more expensive bikes, like a stylish frame with internal shift cable and brake hose routing, which can help your cables last longer by protecting them from the elements.

Upgrade your pedals and love your bike more

Pedals are two of the five touchpoints that connect you with your bike, and even though this bike comes with a pair, upgrading to pedals that boost control and grip will greatly improve your ride. See the pedal guide and find the best pedals for your riding style. We recommend flat pedals for simple versatility.

Rear kickstand mount

Chainstay mounts make it easy to install a rear kickstand that stays out of your way and supports bikes of all sizes. No more laying or leaning.

Rack mounts

Going for a long ride? Rack mounts make carrying accessories a breeze.

Blendr stem

Bontrager stem technology lets you clip your gear directly to the stem for clean looks, maximum user friendliness.

Internal cable routing

We route shift and brake cables through the frame to keep things clean and simple. And it looks great, too.

Mechanical disc brakes

Reliable stopping power in all conditions, including wet and muddy.

Subscribe to my YouTube channel for video reviews.

Trek Marlin 4, 5, 6, 7, and 8 Compared: Which One to Choose?

CyclistsHub is supported by its readers. We may receive a commission if you buy products using our links.

In this article, I’ll help you navigate the Trek Marlin mountain bike family by comparing the Marlin 4, 5, 6, 7, and 8. You’ll learn about the differences between each model, who they are best suited for, and more. 

KEY TAKEAWAY

Trek Marlin mountain bikes are ideal for beginners and intermediate riders. They are suitable for cross-country-like terrains. They have relatively short fork travel and no rear suspension, so I recommend avoiding too demanding terrains and technical trails. For those, check out Trek Roscoe .

Marlins differ only in components. I believe the Marlin 6 provides the best value for money because it has a modern 10-speed 1X Shimano Deore drivetrain and Tektro hydraulic disc brakes, and it’s priced in the middle of the entire Marlin range.

Plus, I’ll tell you which model gives you the best value for your money to help make your decision easier.

Trek Marlin 4 vs. 5 vs. 6 vs. 7 vs. 8

The following table summarizes the main differences between all Marlins that belong among the Trek hardtail mountain bikes .

Marlin Pros & Cons Summary

I summarized the pros & cons of the Marlin series below.

Marlin Pros

• Affordability
• Availability in multiple sizes and colors
• Compatible with racks, kickstands, etc.
• Partially internal cable routing
• Lifetime warranty

Marlin Cons

• Unsuitable for demanding MTB terrain due to the short fork travel (100mm)
• Relatively heavy
• No full-suspension
• No dropper post (except Trek Marlin 8 Gen 3), Gen 3 models are compatible with dropper posts

Marlin Main Features

Let me now explain the most important features of the Trek Marlin bikes.

Frame and Geometry

All Marlin bikes have the same aluminum cross-country frame , available in many sizes and colors that vary between models.

The XXS-S sizes have a differently shaped top tube , which is curved to increase the clearance between the rider’s crotch and the frame. This allows riders with shorter legs to stand over the bike more comfortably, for example, when stopping.

The frames of Gen 2 Marlins have a standard cross-country geometry , which provides a comfortable riding position and easy pedaling uphill and downhill. It also gives you easy maneuverability and visibility.

On the other hand, it’s not quite suitable for steep descents and challenging terrain – especially without a dropper seatpost.

The Gen 3 Marlins have a trail geometry (wider wheelbase) that provides more stability, especially when riding downhill. This geometry is similar to the Trek Roscoe .

Lastly, it’s worth noting that the bike’s partially internally routed cables improve its overall appearance.

One of the biggest limitations of Marlin bikes is their front fork suspension. These bikes are not primarily designed for challenging terrain but rather for those who want a versatile bike that can handle various surfaces.

All Marlin bikes have a suspension travel of only 100mm, which is capable of absorbing small bumps. However, this is not ideal for riding on rocky trails, especially not for downhill riding.

Therefore, if you want a bike for more challenging terrain, choose one with longer travel (for example, the Trek Roscoe series ).

All Marlin bikes’ forks have suspension lockout. Lock them when riding on smooth surfaces to reduce energy loss when pedaling.

Wheels and Tires

The wheel size varies depending on the frame size. Frames smaller than size S are equipped with 27.5″ wheels, which are more agile and accelerate faster than 29″ wheels. Frames size M and larger have 29-inch wheels, which are more stable and better at maintaining speed.

All models have the same rims (Bontrager Connection, double-wall) except for the highest model, the Marlin 8 , which has Bontrager Kove rims. The former rims are not tubeless-ready, while the latter are.

The same goes for the tires. The highest model already has tubeless Maxxis Ardent tires, while lower models have Bontrager XR2 Comp inner tube tires.

The groupset is one of the main areas where the different models vary, and it’s probably the deciding factor for many people.

They differ primarily in the number of gears . Modern mountain bikes mainly use 1X drivetrains , which are popular due to their simplicity for maintenance and shifting. They are also lighter than 2X or 3X groupsets .

On the other hand, they offer fewer gears, so you may not always find the ideal one for your preferred cadence.

I recommend choosing from the 1X drivetrains available on Marlin 6 and higher models. This way, you won’t have to think too much about shifting and cross-chaining.

Another difference between the Marlin models is their brakes. The entry-level Marlin 4 uses mechanical disc brakes , while higher-end models have Tektro or Shimano hydraulic brakes .

Better brakes provide higher braking power. However, if you mainly ride on flat terrain leisurely, you don’t have to worry about a lack of braking performance.

Quality brakes are especially important if you plan on riding technical descents, so consider your riding style.

To learn more about disc brakes, read my article comparing mechanical and disc brakes .

Marlin frames have mounts for kickstands and racks , so you can easily install these accessories.

You can also use a Blendr stem , which is a mechanism that allows you to easily attach things like lights, speedometers, or bike computers.

The last detail is the lock-on grips that are easier to install and replace than slip-on grips.

So, which bike from the Marlin family is the best?

In my opinion, the Marlin 6 is the best choice because it has a modern 10-speed 1X Shimano Deore drivetrain and Tektro hydraulic disc brakes. Plus, it’s priced in the middle of the entire Marlin range.

Another option to consider is the Marlin 5 , which is similar but has a Shimano Altus 2×8spd drivetrain, is lighter, and more affordable.

On the other hand, I recommend avoiding the Marlin 4 because it uses the outdated 3X drivetrain. The value of the Marlin 8 is also questionable, as you can get mountain bikes with better components in this price range.

Trek Marlin FAQ

Trek Marlin mountain bikes are perfect for people new to mountain biking, recreational riders, and those who use their bikes to commute. Marlins are reasonably priced, versatile, and comfortable. They come in various sizes and colors, so you can always find the best fit. However, they have entry-level components that are unsuitable for challenging terrain because their fork travel is short. Check out Trek X-Caliber and Procaliber families if you want a better XC bike.

Marlin bikes (4 to 8) differ mainly in components like the groupset, front fork, brakes, weight, and price. I recommend reading this entire article for more information and a helpful comparison table.

The geometry is the main difference between Trek Marlin Gen 2 and Gen 3. Gen 3 Marlins have a trail geometry, meaning a wider wheelbase provides better stability. Gen 2 has a standard XC geometry. Marlin Gen 3 bikes are heavier, have wider tires and different wheels, and are available in different colors. They are also more expensive (except for the Marlin 7 Gen 2 vs. Gen 3). Most other components, like the groupset, suspension fork, saddle, grips, etc., are the same.

Marlin mountain bikes are a great choice for those who need an affordable bike. They are versatile, allowing you to ride on surfaces like paved roads with potholes, dirt, forest roads, and easy trails. Plus, they have mounting options that make adding accessories like racks and kickstands easy. The high-volume tires and front suspension provide a comfortable ride, better than what you’d get on a gravel bike , for example.

Marlin mountain bikes come with entry-level components that may limit their performance for serious mountain bikers. The groupsets are not as fast and effective, and the fork travel is limited to only 100mm. These bikes are also relatively heavy and don’t have a carbon frame option or a dropper post.

About The Author

Petr Minarik

10 thoughts on “trek marlin 4, 5, 6, 7, and 8 compared: which one to choose”.

You mentioned you can get mountain bikes with better components for try price of the Marlin 8. Which ones come to mind?

Hi Andrew, Check out the Polygon Syncline C3 , which has a longer suspension travel and carbon frame (yes, it’s currently discounted), or Polygon Siskiu D5 , which is a full suspension MTB. 🙂 I hope it helps. – Petr

The Gen 3 Marlin 8 has a dropper post and many other gen 3 models have the holes to run a dropper.

Hi Brandon, Thanks for noticing that. I’ve updated the info. – Petr

Hi Guys, I am interested in Marlin 8, 3 gen. I live in Columbus, OH, what store location is the best for a test drive? Very Respectfully, Luis

Hi Luis, Please, try using Trek store locator . It should give you a list of retailers near you. I hope it helps. 🙂 – Petr

Hi Peter, I purchased a 2022 marlin 7 and I simply love the bike. I usually ride 40 miles a week basically bike trails it handles very well and the braking system is great I would buy this bike all over again. Best regards John from New Jersey.

Hi John, I am glad to hear that. 🙂 I wish you many more miles ahead. – Petr

This blog about Trek Marlin bikes compared has been a tremendous resource for me. Thank you for the awesome content.

I am glad you like it. Thanks. – Petr

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• Marlin 4 Gen 2

Trek Marlin 4 Gen 2

Marlin 4 is the perfect gateway to trail riding. It's ideal for new riders who want a mountain bike with knobby tires that can double as a rugged commuter. Disc brakes, front suspension, 21 speeds, and mounts for a rack and fenders make this a great bike for new trail riders and campus commuters alike. It's right for you if... You want an introductory mountain bike at an incredible price but also want a commuter that's rugged enough to hop curbs on the way to class. The tech you get A lightweight aluminum frame with internal routing to protect your cables and add to the bike's sleek look, 21 speeds, a wide range of gearing so you always have the right gear for your terrain, powerful mechanical disc brakes, and a suspension fork that takes the edge off bumps and rough terrain. The final word Marlin is made for any adventure. The rack and fender mounts make it a great choice for commuters who want to get a little rad on the way to class or the grocery store. Why you'll love it - It's a real mountain bike that's also perfectly suited to daily commutes, rides around campus, or just getting from A to B on any surface - Rack and fender mounts make it easy to accessorize, so your mountain bike can double as a rugged commuter - Smaller frame sizes (XS and S) have short-reach brake levers that make it easier and more comfortable for riders with smaller hands to brake confidently - Marlin models in XS and S frame sizes have a curved top tube and a lower standover height that makes it easier for smaller riders to mount and dismount - Like every model in the Marlin family, it's backed by Trek's lifetime warranty Wheel size: - Sizes X-Small – Small: 27.5-inch - Sizes Medium – XX-Large: 29-inch

Will my bike have a curved top tube?

Smaller frames (XXS-S) have a top tube that dips down as it approaches the seat tube. This design makes for a lower standover height, which is good for shorter riders because it allows them to straddle their bike more easily. The larger frames (M and up) have a straight top tube because taller riders with longer legs typically don’t have the same issues with standover height.

Due to supply-chain issues, Specs are subject to change without notice.

* Subject to change without notice.

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Trek Marlin 4

• AUS $ NZD $ USD $ CAD $ GBP £ EUR €

Weight / M - 14.50 kg / 31.97 lbs (with tubes)

At a glance

Where to buy.

"Look fast, feel fast, go fast."

"Unlike some bikes on the cheap end of the spectrum that cater to the recreational user, this one is aimed firmly at entry-level riders who want a bike that's affordable yet capable of riding and racing hard."

Specifications

• Frame Size: XS , S Alpha Silver Aluminum, low standover, internal routing, chainstay disc brake mount, rack and kickstand mount, 135x5mm QR Size: M , ML , L , XL , XXL Alpha Silver Aluminum, internal routing, chainstay disc brake mount, rack and kickstand mount, 135x5mm QR
• Fork Size: XS SR Suntour XCE 28, coil spring, preload, 42mm offset for 27.5'' wheel, 100mm QR, 80mm travel Size: S SR Suntour XCE 28, coil spring, preload, 42mm offset for 27.5'' wheel, 100mm QR, 100mm travel
• Wheel Size 29"
• Tires Size: XS , S Size: M , ML , L , XL , XXL Bontrager XR2 Comp, wire bead, 30 tpi, 29x2.20''
• Chain KMC Z7, 7 speed
• Crank Shimano Tourney TY301, 42/34/24, 170mm length
• Shifters Shimano Altus EF500, 7 speed
• Cassette Shimano TZ500, 14-28, 7 speed
• Brakeset Size: XS , S , M , ML , L , XL , XXL Tektro MD-M280 mechanical disc, 160mm rotor Size: XS , S , M , ML , L , XL , XXL Tektro MD-M281 mechanical disc
• Handlebar Size: XS , S Bontrager alloy, 31.8mm, 15mm rise, 660mm width Size: XS , S Bontrager alloy, 31.8mm, 5mm rise, 690mm width
• Saddle Bontrager Arvada, steel rails, 138mm width
• Seatpost Size: XS , S Bontrager alloy, 27.2mm, 12mm offset, 330mm length Size: XS , S Bontrager alloy, 31.6mm, 12mm offset, 330mm length
• Stem Size: XS , S Bontrager alloy, 31.8mm, Blendr compatible, 7 degree, 60mm length Size: XS Bontrager alloy, 31.8mm, Blendr compatible, 7 degree, 50mm length
• Headset Semi-integrated, 1-1/8''

Q: Where to buy a 2021 Trek Marlin 4?

The 2021 Trek Marlin 4 may be purchased directly from Trek .

Q: How much does a 2021 Trek Marlin 4 weigh?

A 2021 Trek Marlin 4 weights M - 14.50 kg / 31.97 lbs (with tubes).

Q: What size wheels does the 2021 Trek Marlin 4 have?

The 2021 Trek Marlin 4 has 29" wheels.

Q: What size 2021 Trek Marlin 4 should I get?

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Explore, search and compare thousands of the world’s best mountain bikes here on Mountain Bike Database.

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Trek Marlin 4 Review – Is This Bike Worth Buying?

Mountain bikes can be expensive. If you’ve looked casually at the mountain bike market you probably saw bikes that cost many thousands of dollars. Some potential riders look at these prices and give up. That’s a mistake. Many credible manufacturers make solid, affordable bicycles that can serve as both entry-level mountain bikes and day to day transportation. Some of these bikes cost as little as $500. The Trek Marlin 4 is a leading contender at this price point.

The Trek Marlin 4 is a simple, straightforward bicycle. It’s still a machine that shows real quality. The bike uses components from major manufacturers that make some of the best parts you can buy. That expertise filters down to the entry level components, and while you can’t expect a $500 bike to match a $5000 bike in every way, you might be very pleasantly surprised by what you can do with an entry-level mountain bike.

Image Source: Trekbikes.com

Quick Overview: What I Think of the Trek Marlin 4

Like any entry-level bike, the Trek Marlin 4 has to be rated by its intended purpose and its price point. This is not a high end bike. If you want a bike for cross country racing or aggressive riding on technical trails, this isn’t it. This is a bike designed as an affordable starting point to cycling that can serve double duty as a daily transport bike and an entry level trail bike. It fulfills those functions very well and provides real value for money.

If you look at the Trek Marlin 4 as the next step up from the off-brand bikes that sell for $300-400 at big box stores you get a sense of the value the bike brings. The Marlin 4 represents a huge step up from the bikes that are one tier below it. This is a real mountain bike from a credible manufacturer. It may be one of their least expensive models, but if you’re in the market for an affordable bike you will get a whole lot more from the Marlin 4 than you would from a bike only slightly cheaper.

If you want a bicycle and you have only $500 to spend this would be an excellent way to spend it. It won’t perform like a $5000 bike, but it will be far, far, better, than a $400 bike.

What You Get

Key to when looking at buying any bike, is looking at the frame components and how good they are. Let’s look at the key components of the Marlin 4.

The Marlin 4 frame is made of aluminum.. Trek has been making high-end aluminum frames for decades, and that experience shows in their entry-level frames. The Marlin 4 frame is not the lightest on the market, but the welds are clean and solid, the paint job is first class, and the frame looks like something you’d find on a much more expensive bike. The cables that control the brakes and gear shifting are routed inside the frame tubes, which keeps the outside clean and uncluttered and reduces the likelihood of damage.

The small and extra small Marlin 4 frames feature a top tube that curves down, decreasing the bike’s standover height and making it easier to straddle the bike without the frame hitting you in the crotch. That’s a detail that smaller riders will appreciate.

The Marlin 4 carries a front suspension fork from SR Suntour, a leading Japanese producer of mountain bike suspension. SR Suntour forks lack the light weight and multiple adjustments of high end mountain bike forks, but they absorb impact and they stand up to abuse. The SR Suntour XCE fork on the Marlin 4 may not set you up for huge hucks or win you bling points at the bike shop, but it will soak up the chatter and take impacts off your hands and arms.

The suspension travel on the Marlin 4 is 100mm, except for the XS version, which gets an 80mm fork. That’s low by today’s standards, but it’s enough for the type of riding the bike was designed to do.

The drivetrain is everything that transmits power from the pedals to the rear wheel. This includes the crank, the chain, the front and rear gear sprockets, the front and rear derailleurs that move the chain from one gear to the next, and the handlebar-mounted shifters that control the derailleurs.

The Marlin 4 carries a 3×7 drivetrain: there are three gears in the front and 7 in the rear. The gear range is not exceptionally wide and could be a problem if you will spend a lot of time riding steep hills.

The drivetrain components on the Marlin 4 are selected from Shimano’s entry-level Tourney and Altus lines. These are the lowest-priced components that Shimano makes, but that doesn’t mean they won’t work. Shimano makes some of the best drivetrain parts in the world. That experience filters down to even their cheapest products.Be aware that it will not be easy to upgrade the drivetrain components. 7×3 components are generally not compatible with components with other gear combinations, and most higher-end components will not be available in the 7×3 configuration. You would have to upgrade the entire drivetrain at the same time, and that would come at a significant price.

The Marlin 4 carries mechanical disc brakes made by Tektro. These are basic, reliable brakes that will stop you effectively. Mechanical discs will stop you as effectively as the more expensive hydraulic discs, but they will not deliver the same comfort. Hydraulic brakes allow you to deliver more stopping power with less stress on your hands. That can be a real advantage if you ride down long hills: the hard squeeze required by mechanical discs can even lead to hand cramping and loss of control on long, steep hills. If you ride this kind of terrain you might be better served by a bike with hydraulic disc brakes. You can upgrade the mechanical disc brakes to hydraulics relatively easily.

Trek uses small brake levers with shorter reach for the XS and S sizes of the Marlin 4, which makes the levers easier for small hands to work.

The Marlin 4 carries wheels and tires from Bontrager, an established manufacturer with a reputation for making quality products at accessible prices..Like many modern bikes, the Marlin 4 uses different wheel sizes for different bike sizes: the XS and Small sizes carry 27.5” wheels, the larger sizes use 29”.

The wheels come mounted with Bontrager XR2 Comp tires, which feature low-profile knobs suitable for crossover use between cement and low-intensity trail riding. The wheel-tire combination is on the heavy side, but it’s sturdy and serviceable and will do the job.

Other Components

Trek goes back to Bontrager to fill out the parts catalog, sourcing the saddle, seatpost, handlebar, and stem from the same manufacturer. That concentration probably provides more competitive component costs – big orders get better prices – and delivers solid, functional components. The Bontrager Blendr stem – the component that links the frame to the handlebars – is designed to allow easy mounting of accessories like lights, GPS, bike computers, or a GoPro or similar camera.

Component Roundup

The components that make up the Marlin 4 are all that you would expect – and in some cases a bit more – from an entry level bike from a premium manufacturer. Nothing is high end, but everything is functional and adequate. The components are intelligently selected and fit well together. You may find a bike with better spec in one component, but you will not find a better overall component mix on a bike in this price range.

Let’s rate the Marlin 4 component mix relative to other bikes in the sub-$700 range.

How do all those components fit together, and what spices has Trek added to the overall recipe? Let’s take a look!

Size is a key element in choosing a bicycle. Even a high end bike will not deliver the ride you want if it doesn’t fit you!

Trek produces the Marlin 4 in a wide variety of sizes: XS, S, M, L, XL and XXL. That means there’s a Marlin 4 to fit anyone from 4’6” to 6’8”! Use this chart to select your size:

If you fall between sizes, you may want to select the larger size if you plan to do mainly distance riding or the smaller size if you’ll be leaning toward trail riding. Better yet, find a dealer near you and try the two sizes out. The professionals at a good bike shop can help you choose the best size for you.

The Marlin 4 will accommodate riders up to 300 pounds.

Bike geometry can be an intimidating subject, but there’s no need to go into detail. “Steep” or traditional geometry places the rider immediately above the pedals for optimum power transfer and the front wheel almost under the handlebar for optimum control. “Slack” or “modern” geometry may keep the steep saddle position, but rakes the fork forward and places the front wheel ahead of the rider for stability on steep descents.

The Marlin 4 falls in the traditional category, with a relatively steep head tube angle of 69.3 (XS and S) or 69.5 degrees. That’s a good choice for rolling trails and riding around town, but you will have to drop the seat and keep your weight well back to avoid going over the bars on steep descents. If you plan to ride the steep stuff on a regular basis a bike with slacker angles (but likely a steeper price) might serve better.

Special Additions

You might not expect to find extras on a sub-$500 bike, but Trek has tossed a few surprises into the mix.

• Trek designed the Marlin 4 to be a town/trail crossover, so they’ve provided a kickstand mount.
• The Marlin 4 comes ready to mount with a luggage rack, ideal for anything from bikepacking to carrying school books or groceries, another feature underscoring the multipurpose intent of the bike.
• The XS and S sizes come with short-reach brake levers, smaller wheels, and a curved top tube for lower standover height. There is no “women-specific” version, but the XS and S sizes incorporate many features often found on women-specific bikes.
• The Bontrager Blendr Stem easily mounts multiple accessories.
• Internal cable routing protects cables, prevents snags, and keeps the bike looking clean and uncluttered.

That’s an unusual package to find on a bike at this price point, and it makes the Marlin 4 a leading candidate in the entry level trail/town hybrid market.

Performance

The ride is where it all comes together. The Marlin 4 handles as you would expect it to given its components, geometry, and purpose. To veteran cyclists like myself, it feels familiar, a throwback to the time when we all rode steep-angled hardtails with short-travel forks. Some things have changed, of course. Today’s entry-level shifting is infinitely better to what we had in those days! The low-end Shimano shifters and derailleurs on the Marlin 4 may not be as light, smooth or sophisticated as very expensive high end drivetrains, but they are surprisingly precise and require very little effort. They will do the job and do it well. The 29” wheels hold momentum far better than our old 26”-wheeled bikes, and they roll easily over obstacles, a significant improvement.

One limitation of the 3×7 drivetrain is the lack of very low gears for steep or extended climbs or for long flat-country rides where you want to preserve momentum. Given the purpose of the bike, those are minor limitations. Most people who buy an inexpensive town/trail hybrid will not be placing those demands on it!

The Marlin 4 does well on the entry-level trails it was designed to handle. The fork will handle the chatter of gravel riding or occasional roots and rocks, and the lack of rear suspension will help novice riders learn to stand on the pedals and use their legs to absorb shocks. Hardtails are great for novice trail riders because they help you learn to choose lines and to adjust your weight and body position rather than relying on suspension. The bike’s steep geometry is not designed for steep descents, but if you drop the seat and move your weight back you can roll some surprisingly steep terrain. Jumps and drops are not recommended!

The Marlin 4 also brings quality to the town side of its intended use. The upright position and relatively wide handlebars bring an immediate security and controllability that will appeal to novice riders. The luggage rack capacity makes this a great option for utility transport, and it’s tough enough to hop some curbs or plow through broken pavement if you feel like taking some bumps.

If you order your bike online or buy from anything but a good bike shop, take your bike to a qualified bike mechanic for fine tuning before you ride it. As with many entry level bikes, customer reviews of the Marlin 4 often refer to problems and complaints that come from the assembly and setup of the bike. Bikes are delivered partially assembled in boxes, and final assembly and tuning needs to be done by a qualified mechanic. No bike will perform well if it’s not put together and tuned properly.

The Bottom Line

Like any entry-level bike, the Trek Marlin 4 has to be evaluated according to its purpose. It’s not a featherweight cross-country race machine or a jump-ready enduro bike. If you’re looking for that kind of performance you’ll need to spend a lot more to get the bike you want.

The Marlin 4 is designed to serve budget-conscious riders as a cross country/light trail bike and as general around-town transportation. If that’s what you’re looking for and you want to get a solid, credible bicycle for the lowest possible price, it’s one of the best options available. You can get many better bikes, but you’ll spend a lot more. You can get cheaper bikes, but the quality is likely to be much lower.

Trek deserves some credit for their approach to the Marlin 4. They set out to design a highly functional bike for a specific purpose at the most accessible price point they could manage, and they’ve obviously put some effort into coming up with a package that provides real value. Its not a high-end mountain bike, but it isn’t meant to be. It’s an affordable and very useful bicycle, and if you’re looking for a bike in this niche for under $500, it is definitely one to consider.

Again, let’s rate the Marlin 4’s overall quality relative to other bikes in the sub-$700 range.

• Crosscountry
• Rider Notes

2019 Trek Marlin 4

A 27.5″ / 29″ aluminum frame hardtail crosscountry bike with mid-range components and mechanical disc brakes. Compare the full range

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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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This cheap mountain bike is the perfect gateway drug to your next (trail riding) addiction.

Wide range of gears with 2x9 drivetrain

Wheels and tires aren’t tubeless-ready

Read Review

Jun 2019 · Alan Muldoon

The first of two 29er to make it into the sub 500 category, the Trek Marlin 6 certainly didn't behave like a fish out of water.

Top-rate frame quality, available in seven sizes Independent Shimano shifters

Cable and chain rattle. Rear tyre is too skinny

Last updated April 28 Not listed for 1,862 days

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Trek Marlin 4

Marlin 4 is the perfect gateway to trail riding. It's ideal for new riders who want a mountain bike with knobby tires that can double as a rugged commuter. Disc brakes, front suspension, 21 speeds, and mounts for a rack, fenders, and kickstand make this versatile ride an excellent entry point for new trail riders and campus commuters alike. It's right for you if... You want an introductory mountain bike at an incredible price, but also want a commuter that's rugged enough to hop curbs on the way to class. Disc brakes, knobby tires, and 21 speeds make Marlin 4 a great choice. The tech you get Marlin 4 has 21 speeds with a wide range of gearing for easy riding on varied terrain. It's modeled after our higher-end mountain bikes and built with a lightweight Alpha Silver Aluminum frame that has internal routing to protect your cables, an integrated kickstand mount, mechanical disc brakes for increased stopping power in any weather conditions, and a suspension fork with 75mm of travel—just enough to absorb the big bumps and keep you cruising. The final word Marlin 4's greatest gift is its versatility. It's built-in Trek's mountain bike heritage and totally capable of taking on the trails. But it's an efficient daily rider, too. The rack and fender mounts make it a great choice for commuters who want to get a little rad on the way to class or the grocery store. Why you'll love it - It's a real mountain bike that's also perfectly suited to daily commutes, rides around campus, or just getting from A to B on any surface. - The flat mountain-style handlebar and disc brakes keep you in control, on or off the trail. - Rack and fender mounts make it easy to accessorize, so your mountain bike can double as a rugged commuter. - Internal cable routing makes it easy to spec your bike with upgraded trail tech, like a dropper post. - Like every model in the Marlin family, it's backed by Trek's lifetime warranty.

Wheel size: Sizes X-Small – Small: 27.5-inch Sizes Small – XX-Large: 29-inch

Due to supply-chain issues, specs are subject to change without notice..

* Subject to change without notice.