Trek Powerfly FS+ 4 800Wh Gen 4

Name: Trek Powerfly FS+ 4 800Wh Gen 4
Brand: Trek

2026 MountainTrail Electric bicycle Manufacturer page

Trek Powerfly FS+ 4 800Wh Gen 4, color Mercury / Dark Web

Price: Not published

Prices shown first for United States
Europe: €4,699 Last known price
Travel: 130 / 120 mm Fork / rear shock
Wheels: 29″
Drivetrain: 1 × 10 36t / 11–48t
Gear range: 436%
Battery: 800 Wh
Frame: Aluminum
Brakes: Hydraulic disc

Sizes

Size guide

17.5"
19.5"

The manufacturer did not publish rider heights for these sizes.

Components

27 of 28 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 Aluminium, Removable Integrated Battery (RIB 2.0), tapered headtube, guided internal routing, Motor Armor, Mino Link adjustable geometry, adjustable leverage rate, 34.9 mm seat tube, ABP, UDH, rack and mudguard mounts, Boost 148, 120 mm travel Not identified

Electric system

4 parts

Suspension

2 parts

Drivetrain

6 parts

Bottom bracket
- Bosch
Cassette
- Shimano CS-LG300-10 10 speeds
CS-LG300-10
Chain
- Shimano CN-LG500
CN-LG500
Crankset
- FSA 36t
CK-220
Rear derailleur
- Shimano Cues RD-U6000 11 speeds
RD-U6000
Shifters
- Shimano Cues SL-U6000
SL-U6000

Brakes

2 parts

Wheels and tires

5 parts

Cockpit and contact points

7 parts

Other components

1 part

Fenders
- Trek

Sizes and geometry

2 sizes Open in the geometry plotter

Complete rider-height ranges are not published for these sizes. You can still explore the geometry below.

Size 17.5"

Table

Reach 450mm

Stack 629mm

Wheelbase 1223mm

Head angle 66.0°

Seat angle 77.0°

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 Reach Stack

Complete manufacturer geometry table 2 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	450	475
Stackmm	629	647
Top tube lengthmm	595	630
Seat tube lengthmm	400	420
Head tube lengthmm	110	130
Head tube angle	66°	66°
Seat tube angle	77°	77°
Chainstay lengthmm	461	461
Wheelbasemm	1223	1257
Front centermm	766	799
Bottom bracket dropmm	45	45
Bottom bracket heightmm	329	329
Standover heightmm	780	775
Fork rakemm	50	50
Trailmm	125	125
Stack/reach ratio	1.40	1.36

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
Weight limit: 136 kg

299.8 lb

Suspension

Suspension configuration: Full suspension
Front travel: 130 mm
Rear travel: 120 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 36
Largest chainring: 36
Rear sprockets: 10
Smallest sprocket: 11
Largest sprocket: 48
Lowest gear: 21.8 in
Highest gear: 94.9 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Derailleur hanger: UDH
Seatpost: Dropper seatpost
Shifting: Mechanical

Electric system

Battery capacity: 800 Wh

Additional specifications

Battery: Bosch PowerTube 800 Wh, smart system
Bottom bracket standard: Bosch
Fork spring: Air
Tire clearance: Maximum tire width: 2.5″
Tire width: 2.4″
Wheel material: Aluminum
Wheel size: 29″

Technical analysis

4 measures

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

Front travel

130 mm

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2026
Sample: 1,644 bicycles with this information
Coverage: 96.3% of the class

Lowest gear

21.8 gear inches

This value is above the central range for this class.

Cohort: Mountain / Trail Model year: 2026
Sample: 1,229 bicycles with this information
Coverage: 72.0% of the class

Highest gear

94.9 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2026
Sample: 1,229 bicycles with this information
Coverage: 72.0% of the class

Shifting

Mechanical

389 of 1,706 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2026
Sample: 1,706 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 8.3 km/h
Highest gear: 36.4 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: 21.8–94.9 gear inches
Class reference (p10–p90): 17.1–98.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2026
Lowest gear: 1229 bicycles with this information, 72.0% of the class
Highest gear: 1229 bicycles with this information, 72.0% 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 2026 builds

Differences across 2026 builds
Specification	This bicycle Trek Powerfly FS+ 4 800Wh Gen 4	Trek Powerfly FS+ 4	Trek Powerfly FS+ 4 Equipped 800Wh Gen 4	Trek Powerfly FS+ 4 Equipped Gen 4	Trek Powerfly FS+ 4 Gen 4	Trek Powerfly FS+ 6 Gen 4
Frame
Bicycle weight	Not informed	24.58 kg	27.41 kg	26.5 kg	25.58 kg	25.08 kg
Drivetrain
Smallest chainring	36	36	36	36	36	Not informed
Largest chainring	36	36	36	36	36	Not informed
Rear sprockets	10	10	10	10	10	12
Smallest sprocket	11	11	11	11	11	10
Largest sprocket	48	48	48	48	48	51
Lowest gear	21.8 in	21.8 in	21.8 in	21.8 in	21.8 in	Not informed
Highest gear	94.9 in	94.9 in	94.9 in	94.9 in	94.9 in	Not informed
Electric bicycle systems
Battery capacity	800 Wh	600 Wh	800 Wh	600 Wh	600 Wh	800 Wh
Other specifications
Bottom bracket standard	Bosch	Bosch	Bosch	Bosch	Bosch	Not informed
Wheel size	29″	27.5″ / 29″	27.5″ / 29″	27.5″ / 29″	27.5″ / 29″	27.5″ / 29″