4 Series


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.

When you're ready for longer days on the bike, for tougher challenges on the trail, for the full mountain biking experience, you're ready for 4 Series.

Feature tour


  1. Trickle-down technology

    Race-bred tech makes for a better ride, giving you the benefit of years of Trek high-end XC development.

  2. XC light, mountain tough

    Hydroformed Alpha Aluminum frame is race light, mountain strong, and ride tuned for peak performance.

  3. Perfect fit

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

  4. Limited lifetime warranty

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

I would buy this bike again and again. The lockout suspension is awesome, the brakes are awesome, the price is awesome. Everything about this bike is awesome—I can't find one bad thing about this bike

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