The Trek FX Sport SL 4 is a lightweight carbon fitness bike designed for riders who want road-bike speed with the comfort, confidence, and control of a flat handlebar. Its 400 Series OCLV Carbon frame and carbon fork help smooth rough road surfaces while maintaining an efficient, responsive ride for fitness workouts, fast recreational rides, and group outings.
A Shimano CUES 1×10-speed drivetrain simplifies shifting while maintaining a wide gearing range. The 42T narrow-wide chainring pairs with an 11-48T LINKGLIDE cassette to provide gearing for climbs, rolling terrain, and faster paved riding.
Shimano hydraulic disc brakes provide dependable stopping control in changing conditions. Bontrager Paradigm Tubeless Ready wheels and wide 700 x 40C Bontrager GR1 Expert tires add comfort, traction, and mixed-surface versatility.
The frame includes internal cable routing, hidden fender compatibility, and DuoTrap S compatibility, making the FX Sport SL 4 suitable for riders who want a fast fitness bike that can be adapted for training, commuting, and everyday use.
Key Features
– Lightweight 400 Series OCLV Carbon frame
– Carbon fork designed to help smooth rough surfaces
– Flat handlebar for comfortable and controlled handling
– Shimano CUES 1×10-speed drivetrain
– Wide-range 11-48T cassette
– 42T narrow-wide chainring
– Shimano hydraulic disc brakes
– Bontrager Paradigm Tubeless Ready wheels
– Bontrager GR1 Expert 700 x 40C tires
– Internal cable routing
– DuoTrap S compatibility
– Front and rear fender compatibility
– Blendr-compatible stem
– Maximum total weight limit of 300 pounds
Frameset
– Frame: 400 Series OCLV Carbon
– Cable routing: Internal
– Chain keeper: 3S chain keeper
– Sensor compatibility: DuoTrap S
– Fender mounts: Yes
– Rear brake mount: Flat mount disc
– Rear axle: 135 x 5mm ThruSkew
– Fork: Carbon
– Fork fender compatibility: Hidden fender mounts
– Front brake mount: Flat mount disc
– Front axle: 100 x 5mm thru-skew
Drivetrain
– Drivetrain configuration: 1×10-speed
– Shifter: Shimano CUES U6000
– Shifter feature: Optical gear display
– Rear derailleur: Shimano CUES U6000 GS
– Crankset: Prowheel alloy
– Chainring: 42T narrow-wide
– Cassette: Shimano CUES LG300 LINKGLIDE
– Cassette range: 11-48T
– Cassette speeds: 10
– Chain: Shimano LG500
– Chain compatibility: 9, 10, and 11-speed
– Maximum chainring size: 44T for a 1x drivetrain
– Pedals: Bontrager City pedals
Brakes
– Brake type: Shimano hydraulic disc
– Brake levers: Shimano MT201
– Brake calipers: Shimano UR300
– Brake rotors: Shimano RT10
– Rotor mounting system: Center Lock
– Rotor size: 160mm
Wheels and Tires
– Rims: Bontrager Paradigm
– Rim compatibility: Tubeless Ready
– Rim spoke count: 32-hole
– Internal rim width: 21mm
– Valve type: Presta
– Front hub: Formula CL-51 alloy
– Front hub spacing: 100 x 5mm
– Rear hub: Formula CL-52 alloy
– Rear hub spacing: 135 x 5mm
– Front skewer: 135 x 5mm bolt-on
– Rear skewer: 169 x 5mm bolt-on
– Tires: Bontrager GR1 Expert
– Tire protection: Hard-Case Lite
– Tire bead: Wire
– Tire casing: 60 TPI
– Tire size: 700 x 40C
– Maximum tire clearance: 42C
Cockpit and Contact Points
– Handlebar: Bontrager Satellite Plus IsoZone
– Handlebar material: Aluminum
– Handlebar clamp diameter: 31.8mm
– Handlebar rise: 15mm
– Handlebar width: 660mm
– Stem: Bontrager Elite
– Stem clamp diameter: 31.8mm
– Stem compatibility: Blendr
– Stem angle: 7 degrees
– Seatpost: Bontrager aluminum
– Seatpost diameter: 27.2mm
– Seatpost offset: 12mm
– Seatpost length: 330mm
– Saddle: Bontrager Commuter Comp
Weight and Capacity
– Approximate bike weight: 10.50kg
– Approximate bike weight: 23.15 pounds
– Weight reference: Size M
– Maximum total weight limit: 300 pounds
– Maximum total weight includes the bicycle, rider, and cargo
– Trek reserves the right to make changes to product information, specifications, models, colors, materials, and pricing without notice.
