Trek powerfly fs 4 gen 3

$4,749.99 Sale Save
Color MATTE/GLOSS BLACK

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Powerfly FS 4 is a full suspension electric mountain bike built to tackle rugged trail adventures. The plush suspension setup soaks up rough terrain, and the powerful Bosch electric drive system boosts your capacity to crush climbs and mile after mile of singletrack.
  • For e-MTB, full suspension is a game-changer: it soaks up rugged terrain so you can ride the Bosch pedal-assist smart system to its full potential
  • Treks Removable Integrated Battery (RIB) system looks great and is super user-friendly: it fully hides the battery in the frame for protection, makes it easy to remove the battery without tools, and lets you mount a water bottle cage—even on full suspension e-MTBs
  • The dropper post lets you lower your saddle on the fly so its out of the way on descents
  • It comes equipped with Walk Assist and an intelligent e-MTB mode that automatically delivers the right amount of power based on your terrain
  • Powerfly FS frames feature a curved top tube that makes standing over the bike easier. Plus, Smart Wheel Sizing means youll get the fastest wheel that fits—29˝ wheels on larger frames, 27.5˝ wheels on smaller frames

Removable Integrated Battery

RIB is a one-piece battery and cover with a built-in handle that can easily be removed and re-installed in the frame with no tools and no hassle. It’s the most convenient way to remove your battery for transport, security, or just easier charging.

Bosch Performance Line CX motor

Bosch Performance Line CX sets the standard for eMTB performance with up to 85Nm of torque and an intelligent eMTB mode with Extended Boost that automatically adjusts the amount of assist based on the terrain.

Bosch LED Remote

The Bosch smart system LED remote lets you easily change assist modes, activate walk mode, or turn on optional lights. The bright LEDs are easy to see in any light, and show you your battery level and assist mode at a glance.

Bosch Intuvia 100 display

The Bosch smart system Intuvia 100 display puts your ride data front and center with a large-font high-contrast display thats easy to read in any weather. You get eBike Lock theft protection, and best of all, its completey wireless and connects to the remote via Bluetooth.

Active Braking Pivot

Active Braking Pivot allows our engineers to tune how the suspension reacts to acceleration and braking forces independently. That means you get more confident control when you need it most.

Bosch eBike Flow app

The new eBike Flow app turns your ride into a personalized experience. Use it to customize your motors assist behavior, track your ride stats, and integrate your data with apps like Strava and Apple Health. Theres even handy features like navigation and service reminders.


Frame Alpha Platinum Aluminum, Removable Integrated Battery (RIB), tapered head tube, internal routing, Motor Armor, rocker link, rack and fender mount, ABP, Boost148, 100mm travel
Fork 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
Shock SR Suntour Edge R, 190mm x 45mm
Wheel Front /
Tire Bontrager XR3 Comp, wire bead, 30tpi, 27.5x2.35
Hub Front Bontrager sealed bearing, alloy axle, 6-bolt, Boost110, 15mm thru axle
Hub Rear Bontrager Approved DC-3248, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148, 12mm thru axle
Rim Alex MD35, tubeless compatible, 32-hole, 35mm width, Presta valve
Skewer Rear Bontrager Switch thru axle, removable lever
Shifter Shimano Deore M4100, 10 speed
Rear Derailleur Shimano Deore M5120, long cage
Crank FSA Bosch CK-220, 36T ring, 165mm length
Cassette Shimano Deore M4100, 11-46, 10 speed
Chain KMC X10, 10 speed
Chainring FSA, 36T, steel
Brake Rotor Tektro, 6-bolt, 203mm
Pedal VP-536 nylon platform
Saddle Bontrager Arvada, steel rails, 138mm width
Seatpost TranzX JD-YSP18, 100mm travel, internal routing, 31.6mm, 361mm length
Seat Collar Bolt-on, 36.4mm
Handlebar Bontrager alloy, 31.8mm, 15mm rise, 720mm width
Stem Bontrager Comp, 31.8mm, Blendr compatible, 7 degree, 60mm length
Headset FSA IS-2
Grips Bontrager XR Trail Comp, nylon lock-on
Battery Bosch PowerTube 500Wh, smart system
Controller Bosch Intuvia 100, smart system
Motor Bosch Performance Line CX, smart system, magnesium motor body, 85 Nm
Charger Bosch standard 4A, 110V, smart system

Geometry Chart

B B Drop 2.4
B B Height 33.2
Chainstay Length 46.8
Eff Seat Tube Angle 76.0°
Eff Top Tube 55.4
Frame Reach 40.5
Frame Size Letter XS
Frame Size Number 14.5"
Frame Stack 59.9
Head Angle 66.5°
Head Tube Length 14
Offset 4.4
Position Low
Seat Tube 36.8
Seat Tube Angle 68.3°
Standover 69.1
Trail 10.7
Wheelbase 117
Wheel Size 27.5"
B B Drop 2.4
B B Height 33.2
Chainstay Length 46.8
Eff Seat Tube Angle 76.0°
Eff Top Tube 56.4
Frame Reach 41.5
Frame Size Letter S
Frame Size Number 15.5"
Frame Stack 59.9
Head Angle 66.5°
Head Tube Length 14
Offset 4.4
Position Low
Seat Tube 39.5
Seat Tube Angle 68.3°
Standover 69.1
Trail 10.7
Wheelbase 118
Wheel Size 27.5"
B B Drop 3.9
B B Height 33.5
Chainstay Length 47
Eff Seat Tube Angle 76.0°
Eff Top Tube 58.9
Frame Reach 43
Frame Size Letter M
Frame Size Number 17.5"
Frame Stack 63.7
Head Angle 66.5°
Head Tube Length 13
Offset 4.4
Position Low
Seat Tube 42
Seat Tube Angle 67.5°
Standover 71.2
Trail 11.4
Wheelbase 120.6
Wheel Size 29"
B B Drop 3.9
B B Height 33.5
Chainstay Length 47
Eff Seat Tube Angle 76.0°
Eff Top Tube 62.1
Frame Reach 46
Frame Size Letter L
Frame Size Number 19.5"
Frame Stack 64.6
Head Angle 66.5°
Head Tube Length 14
Offset 4.4
Position Low
Seat Tube 45
Seat Tube Angle 67.5°
Standover 71.6
Trail 11.4
Wheelbase 124
Wheel Size 29"
B B Drop 3.9
B B Height 33.5
Chainstay Length 47
Eff Seat Tube Angle 76.0°
Eff Top Tube 64.6
Frame Reach 48.5
Frame Size Letter XL
Frame Size Number 21.5"
Frame Stack 64.6
Head Angle 66.5°
Head Tube Length 14
Offset 4.4
Position Low
Seat Tube 50
Seat Tube Angle 67.5°
Standover 71.3
Trail 11.4
Wheelbase 126.5
Wheel Size 29"