Bike Comparison
    FX Sport Carbon 42021 Trek
    Recommended
    MSRP
    		$1,819
    Where to Buy
    —
    $1

    At

    Category
    		Fitness
    Weight
    		21.1 lbs
    7.3
    Frame
    		Carbon
    Fork
    		Carbon
    Wheels
    		Aluminum
    Wheel Size
    		700c
    Brakes
    		Hydraulic Disc
    Motor
    Battery
    Groupset
    		GRX 800, 105
    Drivetrain
    		1 × 11
    Brand Site

    trekbikes.com

    Summary
    		The Trek FX Sport Carbon 4 is a 700c carbon frame fitness bike with upper mid-range components and hydraulic disc brakes.
    Similar Bikes
    Accessories
    Ride Feel

    Based on frame geometry and build specs.

    Rider Position
    relaxedaggressive
    FX Sport Carbon 4
    Other Fitness bikes
    Gear Range

    A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

    Lowest gear

    (climbing)

    31 mph

    FX Sport Carbon 4

    Highest gear

    (descending)

    Spec Level

    Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.

    Geometry
    Specs
    FX Sport Carbon 42021 Trek
    Frame

    400 series OCLV carbon, IsoSpeed, internal routing, 3s chain keeper, DuoTrap S compatible, fender mounts, flat mount disc, 142x12mm thru axle

    BB Standard: BB86/BB92, 86.5mm, Press Fit

    Tire Clearance: 35c

    Colors: Dark Aquatic / Carbon Smoke; Quicksilver / Carbon Smoke

    Fork

    FX Carbon, threadless alloy steerer, hidden fender mounts, flat mount disc, 405mm axle-to-crown, 100x12mm thru axle

    Bottom Bracket

    Shimano BB71, 86.5mm, PressFit

    Headset

    1-1/8'' threadless, sealed cartridge bearings

    Stem

    Size: XS, Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 90mm length; Size: S, M, Bontrager Elite, 31.8mm clamp, Blendr compatible, 7 degree, 100mm length; Size: L, XL, Bontrager Elite, 31.8mm clamp, Blendr compatible, 7 degree, 110mm length

    Handlebar

    Size: XS, S, Bontrager Satellite Plus IsoZone, alloy, 31.8mm, 15mm rise, 600mm width; Size: M, L, XL, Bontrager Satellite Plus IsoZone, alloy, 31.8mm, 15mm rise, 660mm width

    Saddle

    Bontrager H1

    Seatpost

    Bontrager alloy, 27.2mm, 12mm offset, 330mm length

    Pedals

    Wellgo M141, resin body, alloy cage

    Grips

    Bontrager Satellite IsoZone Plus, lock-on, ergonomic

    Groupset
    Rear Derailleur

    Shimano GRX RX812, long cage, 42T max cog

    Crank

    Size: XS, S, Shimano GRX RX600, 40T ring, 170mm length; Size: M, L, XL, Shimano GRX RX600, 40T ring, 175mm length

    Shifters

    Shimano RS700, 11 speed

    Cassette

    Shimano SLX M7000, 11-42, 11 speed

    Chain

    Shimano HG601

    Brakes

    Size: XS, S, M, L, XL, Shimano hydraulic disc, MT201 lever, UR300 caliper; Size: XS, S, M, L, XL, Shimano MT201 hydraulic disc, flat mount, 160mm rotor

    Wheels
    Rims

    Bontrager Tubeless Ready Disc, 32-hole, presta valve

    Spokes

    14g stainless steel

    Front Hub

    Formula alloy, centerlock disc, 100x12mm thru-axle

    Rear Hub

    Shimano RXC400, centerlock, Shimano 11-speed freehub, 142x12mm thru axle

    Tires

    Bontrager R1 Hard-Case Lite, wire bead, 60 tpi, 700x32c

    Disc Rotors

    Shimano RT10, centerlock, 160mm

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