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2025 Trek

Powerfly FS+ 8 Gen 4

A 27.5″ / 29″ aluminum frame full suspension trail e-bike with high-end components.
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Manufacturer Price

€6,499($7,527)
Weight54.0 lbs  
FrameAluminum
SuspensionFull, 120 / 130mm
ForkFox Rhythm Float 36
ShockFox
Wheels27.5″ / 29″ Aluminum
Drivetrain1 × 12 Electronic
GroupsetEagle AXS, GX Eagle Transmission
MotorBosch 600W 85Nm mid-drive
BatteryBosch 800Wh
BrakesSRAM DB8 Hydraulic Disc
SeatpostDropper
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Insights
Ride Feel

Based on frame geometry and build specs.

Terrain
easyextreme
Handling
nimblestable
Powerfly FS+ 8 Gen 4
Other Trail bikes
Spec Level

Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.

Compare the full Powerfly model range

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Sizing
15.5"

5'1" – 5'6"

17.5"

5'4" – 5'11"

19.5"

5'8" – 6'3"

21.5"

6'1" – 6'5"

Rider Fit Notes

None yet.

Do you have this bike? Help other riders make a decision about which size will work for them by sharing your own size and fit notes.

Reviews
Downtown
Trek Powerfly FS 9 Equipped

Sep 2022 · Mike Hunger

We have tested the Trek Powerfly FS 9 Equipped with Bosch Performance Line CX motor and 625 Wh battery for you.

Highs
  • Wide range of applications

  • Sporty and stylish look

  • Intuitive handling

  • Bosch SmartphoneHub ensures good connectivity

Lows
  • None

Read Review

BikeRadar
Trek Powerfly FS9 Equipped review

Feb 2022 · Russell Burton

A well-specified, comfortable and versatile ebike, but at a serious price

Highs
  • Comfort

  • Range

  • Stability

Lows
  • Expensive, especially if you’re considering leaving it outside the local shop

Read Review

Geometry
Specs
Build
Frame

Alpha Platinum Aluminium, Removable Integrated Battery (RIB 2.0), tapered headtube, guided internal routing, Motor Armor, angle-adjust headset, Mino Link adjustable geometry, adjustable leverage rate, 34.9 mm seat tube, ABP, UDH, rack and mudguard mounts, Boost 148, 120 mm travel

Hanger StandardUDH

Tire Clearance2.5"

ColorsMatte / Gloss Mulsanne Blue; Gloss Lava / Matte Dark Web

Fork

Fox Rhythm 36, Float EVOL air spring, GRIP damper, tapered steerer, 44 mm offset, Boost110, 15 mm Kabolt axle, 130mm travel

Travel130mm

Spring TypeAir

Shock

Fox Float Rhythm, 2-position damper, 210x50 mm

Travel120mm

Stem

Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 50 mm length

Handlebar

Bontrager Comp, alloy, 31.8 mm, 40mm rise, 780 mm width

Saddle

Bontrager Verse P3, steel rails

Seatpost

Size: S, Bontrager Line Dropper, 100mm travel, MaxFlow, internal routing, 31.6 mm, 310 mm length; Size: M, L, XL, Bontrager Line Dropper, 170 mm travel, MaxFlow, internal routing, 31.6 mm, 450 mm length

TypeDropper

Pedals

VP-536 nylon platform

Grips

Bontrager XR Trail Comp, nylon lock-on

Groupset
Rear Derailleur

SRAM GX Eagle AXS, T-Type

Crank

SRAM GX, 160 mm length

Shifters

SRAM AXS POD

Cassette

SRAM Eagle XS-1275, T-Type,10-52, 12-speed

Chain

SRAM GX Eagle, T-Type, 12-speed

Brakes

SRAM DB 8 4-piston hydraulic disc

TypeSRAM DB8 Hydraulic Disc

Wheels
Rims

Front: Size: S, Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru axle, 27.5"; Size: M, L, XL, Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru axle, 29", Rear: Size: S, Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Boost148, 12mm thru axle, 27.5"; Size: M, L, XL, Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Boost148, 12mm thru axle, 29"

Tires

Size: S, Bontrager Gunnison Pro XR, Tubeless-Ready, wire bead, 60 tpi, 27.5x2.40"; Size: M, L, XL, Bontrager Gunnison Pro XR, Tubeless Ready, dual compound, aramid bead, 60 tpi, 29x2.40"

Electric Components
Motor

Bosch Performance Line CX, 20 mph / 32 km/h max assist (25 km/h max assist in EU and APAC)

Battery

Bosch PowerTube 800 Wh, smart system

Display

Size: S, M, L, XL, Bosch Kiox 300, smart system; Size: S, M, L, XL, Bosch LED remote, smart system

Charger

Bosch standard 4A, 230V, smart system

Accessories
Fenders

Trek 27.5" custom fender

Rider Notes
Riders Also Viewed

First added September 30

Last updated June 27

Not listed for 351 days