Trek

Trek FX Sport 4 2025

$2,599.99
$2,599.99
$2,599.99
Tax included.
If what you're looking for is unavailable call our store 1300 436 379
Color: Matte Onyx Carbon
Size:

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

Overview

Specifications

Sizing

Overview

It's right for you if...

You're ready to log big miles, and you prefer the feel of a flat handlebar to the drop bars that come stock on most road bikes. You prioritise comfort and performance equally, and want the simplicity that a 1x drivetrain provides.

The tech you get

A lightweight 400 Series OCLV Carbon frame and fork, a Shimano CUES 10-speed drivetrain with a wide-range cassette, Shimano hydraulic disc brakes for all-weather stopping power, a lightweight tubeless ready wheel set, wide, fast-rolling Bontrager GR1 Expert gravel tyres and a vibration-absorbing handlebar and ergonomic grips.

The final word

Fast, capable, comfortable. The FX Sport 4 has a road-smoothing carbon frame and quality parts that will hold up over serious miles, including the simpler-shifting 1x drivetrain.


Why you'll love it

  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! 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!

Specifications

*Please note – spec applies to all sizes unless listed separately

Frameset
Frame 400 series OCLV Carbon, internal routing, 3s chain keeper, DuoTrap S compatible, mudguard mounts, flat mount disc, 135x5 mm ThruSkew
Fork Carbon, hidden fender mounts, flat mount disc, 100x5mm thru-skew
Weight
Weight M - 10.50 kg / 23.15 lbs
Weight limit This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).
Drivetrain
Shifter Shimano CUES U6000 w/optical gear display, 10-speed
Rear derailleur Shimano CUES U6000 GS
Crank Prowheel alloy, 42T narrow-wide ring, 175 mm length
Cassette Shimano CUES LG300, LINKGLIDE, 11-48, 10-speed
Chain Shimano LG500
Pedal Bontrager City pedals
Max. chainring size 1x: 44T
Wheels
Hub front Formula CL-51 alloy, 100x5 mm QR
Skewer front 135x5 mm bolt-on
Hub rear Formula CL-52 alloy, 135x5 mm QR
Skewer rear 169x5 mm bolt-on
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 42mm without mudguards, 40mm with mudguards
Components
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 Shimano hydraulic disc, MT201 lever, UR300 calliper
Brake rotor Shimano RT10, CenterLock, 160 mm
Rotor size Max brake rotor sizes: 160 mm front and rear

We 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. Due to supply chain issues, compatible parts may be substituted at any time without notice.

Bike and frame weights are based on pre-production painted frames at time of publication. Weights may vary in final production.

Sizing

How tall are you?

To measure your height, stand up straight, barefoot, with your back, heels, shoulders and head all touching a wall. While looking straight ahead, place a book or straight edge on your head and slowly push it against the wall. Your straight edge should be parallel with the floor. Mark the spot where the bottom of the book is touching the wall. The distance from the marked spot to the floor is your height.

What is your inside leg?

How to measure: Stand barefoot with your back straight and against a wall. Tuck a ruler or something that extends to the floor between your legs. Using both hands, and keeping it level, pull the ruler up into your crotch as if you were sitting on the saddle. Measure the distance from the top edge of the ruler to the ground to find your inside leg measurement. Your inside leg is very important to your final bike size so please measure carefully.

Sizing

size-table
Size Rider Height Inseam
XS

147 - 155 cm

4'10" - 5'1"

69 - 73 cm

27" - 29"

S

155 - 165 cm

5'1" - 5'5"

72 - 78 cm

28" - 31"

M

165 - 175 cm

5'5" - 5'9"

77 - 83 cm

30" - 33"

L

175 - 186 cm

5'9" - 6'1"

82 - 88 cm

32" - 35"

XL

186 - 197 cm

6'1" - 6'6"

87 - 93 cm

34" - 37"

Geometry

All measurements provided in cm unless otherwise stated.

Sizing table
Frame size letter Wheel size A — Seat tube B — Seat tube angle C — Head tube length D — Head angle E — Effective top tube F — Bottom bracket height G — Bottom bracket drop H — Chainstay length I — Offset J — Trail K — Wheelbase L — Standover M — Frame reach N — Frame stack
S 700c 40.6 74.5° 14.0 70.5° 54.3 28.5 6.5 44.2 5.0 7.1 105.4 75.1 38.5 56.8
M 700c 45.7 74.0° 16.5 71.0° 56.3 28.5 6.5 44.2 5.0 6.8 106.5 78.7 39.3 59.4
L 700c 50.8 73.5° 19.0 71.5° 58.3 28.5 6.5 44.2 5.0 6.4 107.5 81.2 40.0 62.0
XL 700c 55.9 72.5° 21.5 72.5° 61.3 28.5 6.5 44.2 5.0 5.8 108.2 84.8 41.0 64.8

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