FX Sport 4 Carbon


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Color: Lithium Grey

  • Dark Aquatic
  • Lithium Grey

Size: Xtra Large

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  • Large
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  • 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. The 1x drivetrain simplifies shifting without sacrificing gear range, making this high-performance bike perfect for everything from solo workouts to speedy group rides.


    1. The 1x drivetrain delivers a wide range of gearing with the simplicity of a single shifter
    2. You get the superior ride quality of carbon without the bank-breaking price
    3. On your left, roadie! This fitness bike is more than capable of taking on speedy group road rides
    4. It's easy to accessorise with mudguards, lights and more!


  • *spec applies to all sizes unless listed separately

    Fork Carbon, hidden mudguard mounts, flat mount disc, 5x100 mm thru-skew
    Hub front Formula CL-51 alloy, 100x5 mm QR
    Hub rear Formula CL-52 alloy, 135x5 mm QR
    Rim Bontrager Paradigm, Tubeless Ready, 32-hole, 21 mm width, Presta valve
    Tyre Bontrager GR1 Expert, Hard-Case Lite, wire bead, 60 tpi, 700x40 c
    Max tyre size 42c without mudguards, 40c with mudguards
    Shifter Shimano Deore M4100, 10 speed
    Rear derailleur Shimano Deore M5120, long cage
    Crank Prowheel alloy, 42T narrow-wide ring, 175 mm length, Presta valve
    Cassette Shimano Deore M4100, 11-46, 10-speed
    Chain KMC X10, 10-speed
    Pedal Bontrager City Pedals
    Max. chainring size 44T
    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
    *Stem Size: XS
    Bontrager Elite, 31.8 mm, Blendr-compatible, 7-degree, 90 mm length
    Size: S, M
    Bontrager Elite, 31.8 mm, Blendr-compatible, 7-degree, 100 mm length
    Size: L, XL
    Bontrager Elite, 31.8 mm, Blendr-compatible, 7-degree, 110 mm length
    Brake Set Promax DSX-927 hydraulic disc, flat mount, 160 mm rotor
    Rotor size Max brake rotor size: 160 mm
    Weight M - 10.74 kg / 23.68 lbs
    Weight limit This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).

    **Trek Bikes 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.

    **Weights are based off pre-production products at time of publication. Weights may vary in final production.

  • Size

    Rider Height



    147 - 155 cm

    4'10" - 5'1"

    69 - 73 cm

    27" - 29"


    155 - 165 cm

    5'1" - 5'5"

    72 - 78 cm

    28" - 31"


    165 - 175 cm

    5'5" - 5'9"

    77 - 83 cm

    30" - 33"


    175 - 186 cm

    5'9" - 6'1"

    82 - 88 cm

    32" - 35"


    186 - 197 cm

    6'1" - 6'6"

    87 - 93 cm

    34" - 37"

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