Trek FX Sport 4

Name: Trek FX Sport 4
Brand: Trek

2025 UrbanFitness Manufacturer page

Trek FX Sport 4, color Gloss Crimson / Matte Deep Smoke

Last known price: $1,799

Prices shown first for United States
Suspension: Rigid
Wheels: 700c
Drivetrain: 1 × 10 42t / 11–48t
Gear range: 436%
Weight: 10.5 kg 23.1 lb · Reference configuration not specified
Frame: Carbon
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

XS 147–156
SM 154–166
MD 164–176
LG 174–187
XL 185–197

Components

17 of 19 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Frame and fork

1 part

Frame

400 series OCLV Carbon, internal routing, 3s chain keeper, DuoTrap S compatible, fender mounts, flat mount disc, 135x5mm ThruSkew Not identified

Suspension

1 part

Fork

Carbon, hidden fender mounts, flat mount disc, 100x5mm thru-skew Not identified

Drivetrain

5 parts

Cassette
- Shimano CS-LG300-10 10 speeds
CS-LG300-10
Chain
- Shimano CN-LG500
CN-LG500
Crankset
- Prowheel 42t
Rear derailleur
- Shimano Cues RD-U6000 11 speeds
RD-U6000
Shifters
- Shimano Cues SL-U6000
SL-U6000

Brakes

2 parts

Wheels and tires

4 parts

Cockpit and contact points

6 parts

Sizes and geometry

5 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 393mm

Stack 594mm

Wheelbase 1065mm

Head angle 71.0°

Seat angle 74.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 700c wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 5 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	383	385	393	400	410
Stackmm	543	568	594	620	648
Top tube lengthmm	528	543	563	583	613
Seat tube lengthmm	356	406	457	508	559
Head tube lengthmm	115	140	165	190	215
Head tube angle	70°	70.5°	71°	71.5°	72.5°
Seat tube angle	75°	74.5°	74°	73.5°	72.5°
Chainstay lengthmm	442	442	442	442	442
Wheelbasemm	1047	1054	1065	1075	1082
Front centermm	613	620	631	641	648
Bottom bracket dropmm	65	65	65	65	65
Bottom bracket heightmm	285	285	285	285	285
Standover heightmm	708	751	787	812	848
Fork rakemm	50	51	50	49	49
Trailmm	74	71	68	64	58
Stack/reach ratio	1.42	1.48	1.51	1.55	1.58

Not published by the manufacturer: Front travel, Rear travel, Crank length, Handlebar width, Stem length, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Carbon
Fork material: Carbon
Bicycle weight: 10.5 kg

23.1 lb
Weight limit: 136 kg

299.8 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 42
Largest chainring: 42
Rear sprockets: 10
Smallest sprocket: 11
Largest sprocket: 48
Lowest gear: 25.4 in
Highest gear: 110.7 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire clearance: Maximum tire width: 42c
Tire width: 40c
Travel: Front: Additional specification: Not available: Yes
Rear: Additional specification: Not available: Yes
Wheel material: Aluminum
Wheel size: 700c

Technical analysis

3 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Lowest gear

25.4 gear inches

This value is within the central range for this class.

Cohort: Urban / Fitness Model year: 2025
Sample: 227 bicycles with this information
Coverage: 81.6% of the class

Highest gear

110.7 gear inches

This value is within the central range for this class.

Cohort: Urban / Fitness Model year: 2025
Sample: 227 bicycles with this information
Coverage: 81.6% of the class

Shifting

Mechanical

13 of 278 bicycles with this information use electronic shifting.

Cohort: Urban / Fitness Model year: 2025
Sample: 278 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 9.7 km/h
Highest gear: 42.4 km/h

Total gear range 436%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 25.4–110.7 gear inches
Class reference (p10–p90): 21.8–131.8 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Urban / Fitness Model year: 2025
Lowest gear: 227 bicycles with this information, 81.6% of the class
Highest gear: 227 bicycles with this information, 81.6% of the class

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Differences across 2025 builds
Specification	This bicycle Trek FX Sport 4	Trek FX 1 Gen 4	Trek FX 2 Equipped	Trek FX 2 Equipped Mid-step	Trek FX 2 Equipped Midstep	Trek FX 2 Equipped Stagger
Frame
Intended fit	Unisex	Unisex	Unisex	womens	womens	womens
Frame material	Carbon	Aluminum	Aluminum	Aluminum	Aluminum	Aluminum
Fork material	Carbon	Steel	Aluminum	Aluminum	Aluminum	Aluminum
Bicycle weight	10.5 kg	13 kg	13.8 kg	13.6 kg	13.6 kg	Not informed
Drivetrain
Front chainrings	1	2	1	1	1	1
Smallest chainring	42	30	40	40	40	40
Largest chainring	42	46	40	40	40	40
Rear sprockets	10	8	9	9	9	9
Smallest sprocket	11	12	11	11	11	11
Largest sprocket	48	32	46	46	46	46
Lowest gear	25.4 in	27.2 in	25.2 in	25.2 in	25.2 in	25.2 in
Highest gear	110.7 in	111.2 in	105.5 in	105.5 in	105.5 in	105.5 in
Brakes
Brake type	Hydraulic disc	Mechanical disc	Hydraulic disc	Hydraulic disc	Hydraulic disc	Hydraulic disc
Other specifications
Tire clearance	Maximum tire width: 42c	Maximum tire width: 40c; Additional specification: Wheel kind: 700	Maximum tire width: 40c; Additional specification: Wheel kind: 700	Maximum tire width: 40c; Additional specification: Wheel kind: 700	Maximum tire width: 40c; Additional specification: Wheel kind: 700	Maximum tire width: 40c; Additional specification: Wheel kind: 700
Tire width	40c	35c	35c	35c	35c	35c
Wheel material	Aluminum	Aluminum	Aluminum	Not informed	Not informed	Not informed

Changes since 2024
Specification	2024 Trek FX Sport 4	This bicycle Trek FX Sport 4
Frame
Bicycle weight	10.74 kg	10.5 kg
Drivetrain
Rear sprockets	11	10
Largest sprocket	51	48
Lowest gear	23.9 in	25.4 in
Other specifications
Tire clearance	Maximum tire width: 42c; Additional specification: Wheel kind: 700	Maximum tire width: 42c