Trek Powerfly FS 4

Name: Trek Powerfly FS 4
Brand: Trek

2021 MountainCross-country Electric bicycle Manufacturer page

Trek Powerfly FS 4, color Matte Gunmetal / Matte Black

Last known price: $4,599

Prices shown first for United States
Travel: 120 / 100 mm Fork / rear shock
Wheels: 27.5″, 29″
Drivetrain: 1 × 10 36t / 11–46t
Gear range: 418%
Battery: 500 Wh
Weight: 24.89 kg 54.9 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

XS 137–155
SM 153–166.5
MD 161–176
LG 173–188
XL 186–196

Components

24 of 26 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

Alpha Platinum Aluminum, Removable Integrated Battery (RIB), tapered head tube, internal routing, Motor Armor, magnesium rocker link, rack and fender mount, ABP, Boost148, 100mm travel Not identified

Electric system

3 parts

Suspension

3 parts

Drivetrain

6 parts

Bottom bracket
- Bosch
Cassette
- Shimano Deore CS-M4100-10 10 speeds
CS-M4100-10
Chain
- KMC X10 10 speeds
Crankset
- FSA 36t
CK-220
Rear derailleur
- Shimano Deore RD-M5120 11 speeds
RD-M5120
Shifters
- Shimano Deore SL-M4100 10 speeds
SL-M4100

Brakes

2 parts

Wheels and tires

5 parts

Front hub
- Bontrager
Rear hub
- Bontrager
Rims
- Alex Rims
Spokes

14g stainless steel Not identified
Tires
- Bontrager

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 430mm

Stack 637mm

Wheelbase 1206mm

Head angle 66.5°

Seat angle 76.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 29″ 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	405	415	430	460	485
Stackmm	599	599	637	646	646
Top tube lengthmm	554	564	589	621	646
Seat tube lengthmm	368	395	420	450	500
Head tube lengthmm	140	140	130	140	140
Head tube angle	66.5°	66.5°	66.5°	66.5°	66.5°
Seat tube angle	76°	76°	76°	76°	76°
Chainstay lengthmm	468	468	470	470	470
Wheelbasemm	1170	1180	1206	1240	1265
Front centermm	703	713	739	773	798
Bottom bracket dropmm	24	24	39	39	39
Bottom bracket heightmm	332	332	335	335	335
Standover heightmm	691	691	712	716	713
Fork rakemm	44	44	44	44	44
Trailmm	107	107	114	114	114
Stack/reach ratio	1.48	1.44	1.48	1.40	1.33

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: Aluminum
Bicycle weight: 24.89 kg

54.9 lb
Weight limit: 136 kg

299.8 lb

Suspension

Suspension configuration: Full suspension
Front travel: 120 mm
Rear travel: 100 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 36
Largest chainring: 36
Rear sprockets: 10
Smallest sprocket: 11
Largest sprocket: 46
Lowest gear: 22.7 in
Highest gear: 94.9 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Dropper seatpost
Shifting: Mechanical

Electric system

Battery capacity: 500 Wh

Additional specifications

Battery: Bosch PowerTube 500
Bottom bracket standard: Bosch
Fork spring: Air
Tire clearance: Maximum tire width: 2.4″
Tire width: 2.3″
Wheel material: Aluminum
Wheel size: 27.5″, 29″

Technical analysis

4 measures

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

Front travel

120 mm

This value is above the central range for this class.

Cohort: Mountain / Cross-country Model year: 2021
Sample: 1,256 bicycles with this information
Coverage: 91.6% of the class

Lowest gear

22.7 gear inches

This value is above the central range for this class.

Cohort: Mountain / Cross-country Model year: 2021
Sample: 1,101 bicycles with this information
Coverage: 80.3% of the class

Highest gear

94.9 gear inches

This value is within the central range for this class.

Cohort: Mountain / Cross-country Model year: 2021
Sample: 1,101 bicycles with this information
Coverage: 80.3% of the class

Shifting

Mechanical

89 of 1,368 bicycles with this information use electronic shifting.

Cohort: Mountain / Cross-country Model year: 2021
Sample: 1,368 bicycles with this information
Coverage: 99.7% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 8.7 km/h
Highest gear: 36.4 km/h

Total gear range 418%

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: 22.7–94.9 gear inches
Class reference (p10–p90): 17.4–100.2 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Cross-country Model year: 2021
Lowest gear: 1101 bicycles with this information, 80.3% of the class
Highest gear: 1101 bicycles with this information, 80.3% 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 2021 builds

Differences across 2021 builds
Specification	This bicycle Trek Powerfly FS 4	Trek Powerfly 4	Trek Powerfly 4 625	Trek Powerfly 5	Trek Powerfly 7	Trek Powerfly FS 4 500
Frame
Bicycle weight	24.89 kg	23.67 kg	23.37 kg	23 kg	23.12 kg	24.83 kg
Suspension
Suspension configuration	Full suspension	Hardtail	Hardtail	Hardtail	Hardtail	Full suspension
Rear travel	100 mm	Not informed	Not informed	Not informed	Not informed	100 mm
Drivetrain
Smallest chainring	36	36	36	34	34	36
Largest chainring	36	36	36	34	34	36
Rear sprockets	10	10	10	12	12	10
Smallest sprocket	11	11	11	11	10	11
Largest sprocket	46	46	46	50	51	46
Lowest gear	22.7 in	22.7 in	22.7 in	19.7 in	19.3 in	22.7 in
Highest gear	94.9 in	94.9 in	94.9 in	89.6 in	98.6 in	94.9 in
Cockpit
Seatpost	Dropper seatpost	Rigid seatpost	Rigid seatpost	Rigid seatpost	Dropper seatpost	Dropper seatpost
Electric bicycle systems
Battery capacity	500 Wh	500 Wh	625 Wh	625 Wh	625 Wh	500 Wh
Other specifications
Bottom bracket standard	Bosch	Bosch	Bosch	Not informed	Not informed	Bosch
Fork spring	Air	Coil	Coil	Air	Air	Air
Suspension	Full suspension	Hardtail	Hardtail	Hardtail	Hardtail	Full suspension
Tire clearance	Maximum tire width: 2.4″	Not informed	Maximum tire width: 2.6″	Maximum tire width: 2.6″	Maximum tire width: 2.6″	Maximum tire width: 2.4″
Tire width	2.3″	2.3″	2.3″	2.3″	2.4″	2.3″