Trek FX Sport 4 2025

FX Sport 4 is a carbon fiber fitness bike for riders who want the speed of a lightweight road bike with the comfort and control of a flat handlebar. The 1x drivetrain simplifies shifting without sacrificing gear range, making this high-performance bike perfect for everything from solo workouts to speedy group rides.

Why you'll love it:

1. The 1x drivetrain delivers a wide range of gearing with the simplicity of a single shifter

2. You get the superior ride quality of carbon without the bank-breaking price

3. On your left! This fitness bike is more than capable of taking on speedy group road rides

4. It's easy to accessorize with fenders, lights, and more!