3 Series

The trail starts here

3 Series is your weekend trail bike, your workday commuter, or both. Versatility, great suspension, smart spec… it's no wonder 3 Series is the world's best-selling mountain bike.

Can't decide between a trail bike and a commuter? Get both, in one bike. 3 Series gives you upright confidence, control, and road-to-trail versatility, wherever you ride.

  1. Light, tough frame Trail-ready Alpha Aluminum frame is rack and fender ready for daily practicality.

  2. Perfect fit Our extended size range guarantees a better fit, so you get a better ride.

  3. Quality components Shimano drivetrains and Bontrager components mean smooth shifting and performance you can count on over the long haul.

  4. Limited lifetime warranty These bikes are built to last, and backed by Trek's limited lifetime warranty.

What people are saying

Super responsive! The 3900's Alpha White Aluminum frame is strong, light, and rigid, which makes for a bike that rips when you stomp on the pedals, maximizing your power. The Shimano parts in the drivetrain offer smooth, solid shifting.

Buyer's Guide