The FX Sport SL 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. Its 400 Series OCLV Carbon frame and carbon fork keep weight down, while a 1x Shimano CUES 10-speed drivetrain with an 11-48 cassette keeps shifting simple without giving up gear range. Hydraulic disc brakes, tubeless-ready rims and mudguard mounts make it a fast, practical bike for solo workouts, group rides and daily riding.
Specifications
| Frame | 400 Series OCLV Carbon, internal routing, 3s chain keeper, DuoTrap S compatible, mudguard mounts, flat mount disc, 135x5 mm ThruSkew |
| Fork | Carbon, hidden mudguard mounts, flat mount disc, 100x5 mm thru-skew |
| Shifter | Shimano CUES U6000 with optical gear display, 10-speed |
| Rear derailleur | Shimano CUES U6000 GS |
| Crank | Prowheel alloy, 42T narrow-wide ring, 175 mm |
| Cassette / chain | Shimano CUES LG300, LINKGLIDE, 11-48, 10-speed — KMC X Glide chain |
| Pedals | Bontrager City pedals |
| Hubs | Formula CL-51 / CL-52 alloy — 100x5 mm front, 135x5 mm rear |
| Rims | Bontrager Paradigm, Tubeless Ready, 32-hole, 21 mm width, Presta valve |
| Tyres | Bontrager GR1 Expert, Hard-Case Lite, wire bead, 60 tpi, 700x40c |
| Brakes | Shimano hydraulic disc, MT201 lever, UR300 calliper — Shimano RT10 160 mm rotors |
| Saddle | Bontrager Commuter Comp |
| Seatpost | Bontrager alloy, 27.2 mm, 12 mm offset, 330 mm length |
| Handlebar | Bontrager alloy, 31.8 mm, 15 mm rise — 600 mm (S), 660 mm (M–L) |
| Stem | Bontrager Elite, 31.8 mm, Blendr-compatible, 7-degree — 100 mm (S–M), 110 mm (L) |
| Grips | Trek ergonomic PRO, lock-on |
Specifications apply to all sizes unless stated otherwise. Specifications are subject to change without notice; due to supply chain availability, compatible components may occasionally be substituted.
Sizing and geometry
Sizing
| Size | S | M | L |
|---|---|---|---|
| Rider height | 155–165 cm | 165–175 cm | 175–186 cm |
| Inseam | 72–78 cm | 77–83 cm | 82–88 cm |
All measurements in cm unless stated otherwise.
| Frame size | S | M | L |
|---|---|---|---|
| Seat tube | 40.6 | 45.7 | 50.8 |
| Seat tube angle | 74.5° | 74.0° | 73.5° |
| Head tube length | 14.0 | 16.5 | 19.0 |
| Head angle | 70.5° | 71.0° | 71.5° |
| Effective top tube | 54.3 | 56.3 | 58.3 |
| Bottom bracket drop | 6.5 | 6.5 | 6.5 |
| Chainstay length | 44.2 | 44.2 | 44.2 |
| Wheelbase | 105.4 | 106.5 | 107.5 |
| Standover | 75.1 | 78.7 | 81.2 |
| Frame reach | 38.5 | 39.3 | 40.0 |
| Frame stack | 56.8 | 59.4 | 62.0 |
Trek bicycles and Bontrager accessories are reserved online and collected in person — this ensures the right size, a proper bike fit and expert guidance before you ride away.
