FX Sport Carbon 4

Trek FX Sport Carbon 4

The Trek 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. An IsoSpeed decoupler smooths out rough roads and the 1x11 drivetrain simplifies shifting without sacrificing gear range, making this high-performance bike perfect for everything from solo workouts to speedy group rides.

It's right for you if...
You're ready to log big miles, and you prefer the feel of a flat handlebar to the drop bars that come stock on most road bikes. You prioritize comfort and performance equally and want the simplicity a 1x drivetrain provides.

The tech you get
A lightweight OCLV Carbon frame with a road-smoothing IsoSpeed decoupler, a Shimano GRX 1x11 drivetrain with a wide-range cassette, Shimano hydraulic disc brakes for all-weather stopping power, a lightweight tubeless-ready wheelset, and ergonomic grips. Plus, it's easy to accessorize with fenders, lights, and more!

The final word
Fast, capable, comfortable. This bike has a road-smoothing carbon frame and quality parts that will hold up over serious miles, but what really sets this model apart is the simpler shifting experience the 1x11 drivetrain provides.

Why you'll love it

• The 1x drivetrain delivers a wide range of gearing with the simplicity of a single shifter
• You get the superior ride quality of carbon without the bank-breaking price
• IsoSpeed—a decoupler at the seat tube/top tube junction that absorbs fatiguing bumps from the road so you can stay stronger longer
• On your left, roadie! This fitness bike is more than capable of taking on speedy group road rides
• You can pair FX Sport with your smartphone and send your ride data to your favorite fitness app when you add DuoTrap S