The 2025 Trek Marlin 4 Gen 2 Hardtail Mountain Bike is the gateway mountain bike to help you get riding off-road. It’s ideal for riders who want a mountain bike with knobby tyres that can double as a rugged commuter. Disc brakes, front suspension, Shimano 14-speed shifting and mounts for a rack and mudguards make this a great bike for trail riders and commuters alike.

The Marlin 4 is built around a lightweight Alpha Silver Aluminium frame with internal routing to protect your cables and add to the bike’s sleek look. The XSmall and Small size bikes come with 27.5″ wheels and a curved top tube while larger sizes come with 29″ wheels and a straight top tube. This makes it easier to get on and off the bike, and improves control, for smaller riders.

The Marlin 4 comes with trustworthy 14-speed Shimano shifting with 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.

This bike is perfect for

Riders who want an introductory mountain bike at an incredible price, but also want a commuter that’s rugged enough to hop kerbs and deal with potholes.

Key Features

• The Marlin Gen 2 gives you all-around versatility with fast-rolling tyres and balanced, neutral geometry that keeps you comfortable and in control off-road. No wonder it’s our best-selling mountain bike ever.
• Rack and mudguard mounts make it easy to accessorise, 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 Trek, it’s backed by a lifetime warranty