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2021 Trek

FX 4 Disc

A 700c aluminum frame fitness bike with upper mid-range components and shimano hydraulic disc brakes.

Manufacturer Price

$1,079
Weight25.4 lbs  
FrameAluminum
SuspensionRigid
ForkCarbon
Wheels700c Aluminum
Drivetrain1 × 11
GroupsetDeore
BrakesShimano Hydraulic Disc
Where to Buy
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Insights
Ride Feel

Based on frame geometry and build specs.

Rider Position
relaxedaggressive
FX 4 Disc
Other Fitness bikes
Gearing

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)

33 mph

FX 4 Disc

35 mph

Similar Bikes

Highest gear

(descending)

Sizing
LG

5'8" – 6'2"

Rider Fit Notes
  • 5'3", size LG, Just right
  • 6'2", size LG, Just right
Reviews
Cycling News
Trek FX 2 Disc Equipped review: Unspectacular but effective

Sep 2022 · Benjamin Page

The Trek FX 2 Disc is a versatile all-rounder with surprising levels of comfort and stability

Highs
  • The frame has a great balance between responsiveness and comfort

  • Equipped for night riding, bikepacking or commuting

  • Can carry a decent amount of weight

  • Stable ride for long distances

Lows
  • Would need a drivetrain upgrade to become a serious fitness bike

  • On the heavy side for a rigid frame

Read Review

BikeRadar
Trek FX Sport 6 review

Nov 2018 · Ian Osborne

High-class fitness bike with proven road technology and a classy component package. Buy if you want a capable, high-spec yet sensible-handling bike with a flat bar

Highs
  • Comfortable-yet-fun ride, IsoSpeed decoupler, lightweight, Shimano 105

Lows
  • Cost is the biggest one, funky-looking grips, only available in black

Read Review

Geometry
Specs
Build
Frame

Alpha Gold Aluminium, DuoTrap S-compatible, internal cable routing, flat-mount disc, rack and mudguard mounts, 135x5 mm QR

BB StandardBSA, 73mm, Threaded

Tire Clearance38c

ColorsLithium Grey; Dnister Black to Radioactive Red Fade

Fork

FX Carbon, rack and mudguard mounts, flat-mount disc, 405 mm axle-to-crown. ThruSkew 5 mm QR

Bottom Bracket

Prowheel PW-BB73+, 68/73mm, threaded external

Headset

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

Stem

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

Handlebar

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

Saddle

Bontrager H1

Seatpost

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

TypeRigid

Pedals

Bontrager City pedals

Grips

Bontrager Satellite IsoZone Plus, lock-on, ergonomic

Groupset
Rear Derailleur

Shimano Deore M5100, long cage, Shadow Plus

Crank

ProWheel alloy, 42T, 175 mm

Shifters

Shimano Deore M5100, 11-speed

Cassette

Shimano Deore M5100, 11-51, 11-speed

Brakes

Size: S, M, L, XL, XXL, Shimano hydraulic disc, MT201 lever, UR300 calliper; Size: S, M, L, XL, XXL, Shimano MT201 hydraulic disc, flat-mount, 160 mm rotor

TypeShimano Hydraulic Disc

Wheels
Rims

Bontrager Affinity Disc, Tubeless Ready, 32-hole, 21 mm width, presta valve

Spokes

14 g stainless steel

Front Hub

Formula DC-20, alloy, 6-bolt, 5x100 mm QR

Rear Hub

Formula DC-22, alloy, 6-bolt, Shimano 8/9/10 freehub, 135x5 mm QR

Tires

Bontrager H2 Comp, wire bead, 30 tpi, 700x32c

Disc Rotors

Shimano RT26, 6-bolt,160 mm

Rider Notes
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First added August 28

Last updated March 18

Not listed for 802 days