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2023 Trek

Powerfly FS 4 Gen 2

A 27.5″ / 29″ aluminum frame full suspension crosscountry e-bike with upper mid-range components.

Manufacturer Price

$4,749
Weight54.7 lbs  
FrameAluminum
SuspensionFull, 100 / 120mm
ForkSuntour XCR Air
ShockSuntour
Wheels27.5″ / 29″ Aluminum
Drivetrain1 × 10
GroupsetDeore
MotorBosch 250W 85Nm mid-drive
BatteryBosch 500Wh
BrakesTektro Hydraulic Disc
SeatpostDropper
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Insights
Ride Feel

Based on frame geometry and build specs.

Terrain
easyextreme
Handling
nimblestable
Powerfly FS 4 Gen 2
Other Crosscountry bikes
Gearing

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Lowest gear

(climbing)

28 mph

Powerfly FS 4 Gen 2

27 mph

Similar Bikes

Highest gear

(descending)

Spec Level

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

Sizing
14.5"

4'9" – 5'2"

15.5"

5'0" – 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

E-Mountainbike Magazine
Trek Powerfly FS 9 Equipped in review – A new generation of E-trekking bike

Sep 2021 · Rudolf Fischer

In our E-trekking bike group test, Trek enter the race with the Powerfly FS 9 Equipped with its Bosch Performance CX motor and many sporty features.

Highs
  • Wide range of applications

  • Predictable handling

  • Spec includes high-quality mountain bike components

  • Many connectivity features through Bosch SmartphoneHub

Lows
  • Untidy cable routing of the cockpitt

Read Review

Electric Bike Review
Trek Powerfly FS 9 Equipped Review

Oct 2020

Price: $5999.00 | Model Year: 2021 | A premium

Observations
  • A premium "do anything" full suspension electric bike that's equipped to handle pavement, trails, light mountain terrain, rain, shine, day, or night conditions. Available in five frame sizes for optimal fit, the XS and S come with 27.5" wheels and the M, L, and XL come with 29" wheels. Sold through one of North America's largest network of dealers. Trek and Bosch provide excellent support and warranty.

  • Custom made extra-wide plastic fenders are durable and quiet, very capable in off-road conditions. A sleek and sturdy rear rack provides 25kg (55lbs) of cargo capacity with pannier hangers on both sides and a removable top platform for trunk bags. Puncture resistant tires also feature unique black reflective stripes that combine safety with aesthetics.

  • Downtube-integrated battery pack and mid-drive motor keep weight low and center. Trek designed a "RIB" battery casing includes a handle for safe removal and transport. The battery doesn't rattle, and it can be charged on or off the bike with the fast 4 amp charger. Peformance Line CX motor is the most powerful from Bosch, but lightweight with a magnesium casing.

  • Highly adjustable air suspension front and rear with 120mm and 100mm travel respectively. Boost hub spacing and thru-axles increase wheel strength. Extra large 203mm hydraulic disc brakes with heat sinks and alloy cores deliver incredible stopping power. The biggest trade-offs here include the high price, smartphone display (that some may not like), louder motor operation, and increased weight (due to the high capacity battery and accessories).

Read Review

Bikerumor
All-new Trek Powerfly full suspension e-MTBs hit the trails...and the street?

Sep 2020 · Tyler Benedict

The 2021 Trek Powerfly full suspension e-MTBs blend European sensibility with modern trail capability for a unique e-mountain bike option.

Read Review

Geometry
Specs
Build
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

BB StandardBosch, Press Fit

Tire Clearance2.4"

ColorCrimson / Lithium Grey

Fork

Size: XS, S, SR Suntour XCR 34, air spring, LO R damper, hydraulic lockout, tapered steerer, 41mm offset, oversized crown for eMTB, Boost110, 15mm bolt-on thru axle, 100mm travel; Size: M, L, XL, SR Suntour XCR 34, air spring, LO R damper, hydraulic lockout, tapered steerer, 44mm offset, oversized crown for eMTB, Boost110, 15mm bolt-on thru axle, 120mm travel

Travel120mm

Spring TypeAir

Shock

SR Suntour Edge R, 190mm x 45mm

Travel100mm

Bottom Bracket

Bosch, press-fit

Headset

FSA IS-2

Stem

Size: XS, S, Bontrager Comp, 31.8mm, Blendr compatible, 7 degree, 60mm length; Size: M, L, XL, Bontrager Comp, 31.8mm, Blendr compatible, 7 degree, 70mm length

Handlebar

Bontrager alloy, 31.8mm, 15mm rise, 720mm width

Saddle

Bontrager Arvada, steel rails, 138mm width

Seatpost

Size: XS, S, M, TranzX JD-YSP18, 100mm travel, internal routing, 31.6mm, 361mm length; Size: L, XL, TranzX JD-YSP18, 130mm travel, internal routing, 31.6mm, 425mm length

TypeDropper

Pedals

VP-536 nylon platform

Grips

Bontrager XR Trail Comp, nylon lock-on

Groupset
Rear Derailleur

Shimano Deore M5120, long cage

Crank

FSA Bosch CK-220, 36T ring, 165mm length

Shifters

Shimano Deore M4100, 10 speed

Cassette

Shimano Deore M4100, 11-46, 10 speed

Chain

KMC X10, 10 speed

Brakes

Tektro HD-M275 hydraulic disc

TypeTektro Hydraulic Disc

Wheels
Rims

Alex MD35, tubeless compatible, 32-hole, 35mm width, Presta valve

Spokes

14g stainless steel, black

Front Hub

Bontrager sealed bearing, alloy axle, 6-bolt, Boost110, 15mm thru axle

Rear Hub

Bontrager Approved DC-3248, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148, 12mm thru axle

Tires

Size: XS, S, Bontrager XR3 Comp, wire bead, 30tpi, 27.5x2.35''; Size: M, XL, Bontrager XR3 Comp, wire bead, 30tpi, 29x2.30''

Disc Rotors

Tektro, 6-bolt, 203mm

Electric Components
Motor

Bosch Performance CX, magnesium motor body, 250 watt, 85 Nm, 20mph or 32km/h max assist

Battery

Bosch PowerTube 500Wh

Display

Bosch Purion

Charger

Bosch compact 2A, 100-240V

Accessories
Fenders

Trek Powerfly 29'' custom fender

Rider Notes
Riders Also Viewed

First added May 18

Last updated March 8

Not listed for 461 days