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
*spec applies to all sizes unless otherwise noted
||400 series OCLV carbon, IsoSpeed, internal routing, 3s chain keeper, DuoTrap S-compatible, mudguard mounts, flat-mount disc, 142x12 mm thru axle
||FX Carbon, threadless alloy steerer, hidden mudguard mounts, flat-mount disc, 405 mm axle-to-crown, 100x12 mm thru axle
||Formula alloy, CenterLock disc, 100x12 mm thru-axle
||Bontrager Switch thru axle, removable lever
||Shimano RXC400, CenterLock, Shimano 11-speed freehub, 142x12 mm thru axle
||Bontrager Switch thru-axle, removable lever
||Bontrager Tubeless Ready Disc, 32-hole, Presta valve
||14 g stainless steel
||Bontrager R1 Hard-Case Lite, wire bead, 60 tpi, 700x32 c
|Max tire size
||35c without fenders, 32c with fenders
||Shimano RS700, 11-speed
||Shimano GRX RX812, long cage, 42T max cog
||Size: XS, S
Shimano GRX RX600, 40T ring, 170 mm length
|Size: M, L, XL
Shimano GRX RX600, 40T ring, 175 mm length
||Shimano BB71, 86.5mm, PressFit
||Shimano SLX M7000, 11-42, 11-speed
||Wellgo M141, resin body, alloy cage
||Bontrager alloy, 27.2 mm, 12 mm offset, 330 mm length
||Size: XS, S
Bontrager Satellite Plus IsoZone, alloy, 31.8 mm, 15 mm rise, 600 mm width
|Size: M, L, XL
Bontrager Satellite Plus IsoZone, alloy, 31.8 mm, 15 mm rise, 660 mm width
||Bontrager Satellite IsoZone Plus, lock-on, ergonomic
Bontrager Elite, 31.8 mm, Blendr-compatible, 7-degree, 90 mm length
|Size: S, M
Bontrager Elite, 31.8 mm clamp, Blendr-compatible, 7-degree, 100 mm length
|Size: L, XL
Bontrager Elite, 31.8 mm clamp, Blendr-compatible, 7-degree, 110 mm length
||1-1/8" threadless, sealed cartridge bearings
||Shimano MT201 hydraulic disc, flat-mount, 160 mm rotor
||Shimano RT10, CenterLock, 160 mm
||M - 9.55 kg / 21.06 lbs
||This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 300 pounds (136 kg).
We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colors, and materials.
Bike and frame weights are based off pre-production painted frames at time of publication. Weights may vary in final production.
* Specifications and MSRP are subject to change without notice
** $25 Charge for Shipping of Bike from Distribution to Bike Shop