Features /

4 Series takes its cue from light, fast XC bikes. Dialed geometry, race-inspired tech, and unbeatable ride feel make this an excellent platform for trail riders on a budget.

Upgrades from 3700 Disc

  • Alpha Gold Aluminum frame
  • Shimano 9-speed drivetrain
  • Hayes hydraulic disc brakes
  • Bontrager XR2 off-road tires

Alpha Gold Aluminum

Trek’s high-performance aluminum, with manipulated tube shapes to balance strength and weight saving.

26" wheels

The MTB standard for versatility, light weight, and maneuverability.

Internal derailleur routing

Route your front derailleur cable through the frame to keep your bike running smooth and clean.

Oversize stem and handlebar

31.8mm oversize clamp diameter increases stiffness for more confident, precise handling.

Rack & fender mounts

Built-in mounts make it easy to add racks and fenders for added versatility.

Hydraulic disc brakes

Ultimate control and stopping power in all conditions, including wet and muddy.

Suspension fork

Shock-absorbing fork allows the front wheel to travel up and down over bumps while the handlebars stay steady, for a comfortable, controlled ride.

9 speed

Performance-oriented gearing for performance-oriented bikes and riders.

Trail Ready

Trail Ready means this frame is certified for off-road use.