A Trail-Ready Daily Rider for Adventures On and Off the Path

The Trek Marlin 4 is a hardtail mountain bike designed to handle trail riding and everyday use in equal measure. The frame is built from low-emission aluminium part of Trek's manufacturing transition that began in 2024, with the switch to aluminium produced using renewable energy completed across nearly every alloy model by October 2025. This results in a significantly reduced manufacturing carbon footprint without changing the frame's performance characteristics.

The frame includes internal shift cable and brake hose routing, protecting cables from the elements and extending their service life while giving the bike a cleaner appearance than externally routed alternatives. Rack and kickstand mounts are built into the frame, making it straightforward to fit practical accessories for commuting use without modification. These mounts, combined with the trail geometry and suspension fork, make the Marlin 4 genuinely usable across a wide range of daily situations from weekend trail rides to weekday commutes on varied surfaces.

The Marlin 4 is available in seven frame sizes. The smallest sizes feature a curved top tube that reduces standover height for easier mounting and dismounting, alongside short-reach brake levers and narrower handlebars sized proportionally for smaller riders. Larger sizes use a straight top tube. Trek's Smart Wheel Size system pairs each frame size with the most appropriate wheel diameter the S size in this listing uses 27.5-inch wheels.

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.

Suspension Fork and Shimano CUES ESSA 8-Speed Drivetrain

The Marlin 4 is fitted with a suspension fork that absorbs bumps and surface irregularities from trails, urban roads, and mixed-surface paths. The suspension meaningfully improves comfort and control on imperfect surfaces compared to a rigid fork particularly for riders using the bike across varied terrain on a daily basis where surface quality cannot always be predicted.

The drivetrain uses Shimano CUES with ESSA 8-speed shifting and LINKGLIDE technology. LINKGLIDE is engineered specifically for extended drivetrain longevity, delivering significantly increased life on wear components the chain, cassette, and chainrings compared to standard drivetrains. This durability focus is particularly practical on a bike ridden frequently, where higher mileage accelerates wear on standard components. Shifting remains smooth and decisive throughout the drivetrain's extended service life, and the 8-speed range covers the gear variety needed for trail gradients and everyday urban riding without the complexity of a wider-range system.

A better way to produce aluminum

Starting in 2024, we began removing high-emission aluminum from our manufacturing and replacing it with low-emission aluminum made with renewable energy. By October 2025, nearly every alloy bike we make - this one included - had made the switch, driving a major drop in our footprint.

Rack and Kickstand Mounts for Everyday Commuter Use

One of the Marlin 4's distinguishing practical features is its rack and kickstand mounts frame attachment points that allow you to fit a rear rack and kickstand without adapters or workarounds. These mounts are built in from the factory and reflect an understanding that many mountain bike riders also use their bike for practical daily tasks where carrying capacity and stable parking matter.

A rear rack enables the bike to carry panniers, bags, or a trunk bag for commuting with equipment or running errands. A kickstand allows the bike to stand independently rather than requiring a wall or ground lean for parking. Together these additions transition the Marlin 4 from a trail-only machine into a practical everyday bike without compromising its off-road capability. The rack and kickstand themselves are sold separately and are not included with the bike as standard.

Shimano LINKGLIDE

LINKGLIDE technology has been specifically engineered for incredible durability while still delivering smooth and decisive shifting – along with a great pedalling experience. Available exclusively on Shimano CUES drivetrains.

FAQs

What suspension does the Trek Marlin 4 have?

The Marlin 4 is fitted with a front suspension fork designed to absorb bumps from trails, roads, and mixed surfaces. The fork helps improve comfort and control across varied everyday terrain.

What drivetrain does the Marlin 4 use?

The bike uses a Shimano CUES ESSA 8-speed drivetrain with LINKGLIDE technology. LINKGLIDE is designed for significantly increased longevity on drivetrain wear components including the chain, cassette, and chainrings, while delivering smooth and decisive shifting.

Can I fit a rack and kickstand to the Marlin 4?

Yes. The frame includes dedicated rack and kickstand mounts, making it straightforward to add these accessories. The rack and kickstand are sold separately and are not included with the bike.

What wheel size does the Marlin 4 S 27.5 use?

This size uses 27.5-inch wheels. Trek's Smart Wheel Size system pairs each Marlin frame size with the most appropriate wheel diameter for that frame.

What is the low-emission aluminium used in the Marlin 4?

Starting in 2024, Trek began replacing standard high-emission aluminium in its manufacturing with aluminium produced using renewable energy. By October 2025, the Marlin 4 had completed this transition, resulting in a significantly lower manufacturing carbon footprint for the frame.

How many frame sizes does the Marlin 4 come in?

The Marlin 4 is available in seven frame sizes. Smaller sizes feature a curved top tube for lower standover height, short-reach brake levers, and narrower handlebars. Larger sizes use a straight top tube.

What is LINKGLIDE technology?

LINKGLIDE is a Shimano drivetrain technology available exclusively on Shimano CUES drivetrains. It is engineered for exceptional durability and smooth, decisive shifting, with significantly extended life on the chain, cassette, and chainrings compared to standard drivetrains.

Specs:

Geometry Chart