3 Series


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 confidence, control, and road-to-trail versatility, wherever you ride.

Feature tour


  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.

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

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