Trek FX Sport Carbon 4 2025|X Small|Small|Medium|Large|X Large|Matte Onyx Carbon

Description

FX Sport 4 is a carbon fibre 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.

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 prioritise comfort and performance equally, and want the simplicity that a 1x drivetrain provides.

The tech you get

A lightweight 400 Series OCLV Carbon frame and fork, a Shimano CUES 10-speed drivetrain with a wide-range cassette, Shimano hydraulic disc brakes for all-weather stopping power, a lightweight tubeless ready wheel set, wide, fast-rolling Bontrager GR1 Expert gravel tyres and a vibration-absorbing handlebar and ergonomic grips.

The final word

Fast, capable, comfortable. The FX Sport 4 has a road-smoothing carbon frame and quality parts that will hold up over serious miles, including the simpler-shifting 1x drivetrain.

Specifications

*spec applies to all sizes unless otherwise noted

Frame 400 series OCLV Carbon, internal routing, 3s chain keeper, DuoTrap S compatible, mudguard mounts, flat mount disc, 135x5mm ThruSkew Fork Carbon, hidden mudguard mounts, flat mount disc, 100x5mm thru-skew

Weight

Weight M – 10.50 kg / 23.15 lbs Weight limit This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).

Drivetrain

Shifter Shimano CUES U6000 w/optical gear display, 10-speed Rear derailleur Shimano CUES U6000 GS Crank Prowheel alloy, 42T narrow-wide ring, 175 mm length Cassette Shimano CUES LG300, LINKGLIDE, 11-48, 10-speed Chain Shimano LG500, 9/10/11-speed Pedal Bontrager City pedals Max. chainring size 1x: 44T

Wheels

Hub front Formula CL-51 alloy, 100×5 mm QR Skewer front 135×5 mm bolt-on Hub rear Formula CL-52 alloy, 135×5 mm QR Skewer rear 169×5 mm bolt-on Rim Bontrager Paradigm, Tubeless Ready, 32-hole, 21 mm width, Presta valve Tyre Bontrager GR1 Expert, Hard-Case Lite, wire bead, 60 tpi, 700×40 mm Max tyre size 42mm without mudguards, 40mm with mudguards

Components

Saddle Bontrager H1 Seatpost Bontrager alloy, 27.2 mm, 12 mm offset, 330 mm length *Handlebar 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 Grips Bontrager Satellite IsoZone Plus, lock-on, ergonomic Brake Shimano hydraulic disc, MT201 lever, UR300 calliper Brake rotor Shimano RT10, CenterLock, 160 mm Rotor size Max brake rotor sizes: 160 mm front and rear

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, colours, materials and pricing. Due to supply chain issues, compatible parts may be substituted at any time without notice.

Bike and frame weights are based on pre-production painted frames at time of publication. Weights may vary in final production.