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  • TREK Powerfly FS 4 US M 29 Crimson/Lithium Grey
  • TREK Powerfly FS 4 US M 29 Crimson/Lithium Grey
  • TREK Powerfly FS 4 US M 29 Crimson/Lithium Grey

Powerfly FS 4 US M 29 Crimson/Lithium Grey

$3,999.99
Excl. tax

End-of-season savings.
Pick-up in store only.

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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.

It's right for you if...

You want to get out and explore more trails. You're looking for an e-MTB with trail-smoothing full suspension and the reliable, leg-boosting power of an electric drive system made specifically for the demands of off-road riding.

The tech you get

A durable aluminum frame that fully encases a long-range 500Wh battery, a powerful Bosch Performance CX (250Wh, 85 Nm) motor that helps you sustain speeds of up to 20 mph or 32 km/h, and an ergonomic Purion controller. Plus, a 120mm suspension fork, 100mm of rear travel, a 10-speed Shimano drivetrain, and a dropper post.

The final word

This full suspension e-MTB is comfortable, efficient, and fast on rough terrain. The powerful Bosch electric drive system makes it possible to tackle any climb you encounter and adventure farther than ever.

 

See it in action

favorite_borderWhy you'll love it

  1. For e-MTB, full suspension is a game-changer: it soaks up rugged terrain so you can ride the Bosch pedal-assist system to its full potential
  2. Trek's 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
  3. The dropper post lets you lower your saddle on the fly so it's out of the way on descents
  4. The Purion controller has Walk Assist and an intelligent eMTB mode that automatically delivers the right amount of power based on your terrain
  5. Powerfly FS frames feature a curved top tube that makes standing over the bike easier. Plus, Smart Wheel Sizing means you'll get the fastest wheel that fits—29˝ wheels on larger frames, 27.5˝ wheels on smaller frames

*Please note - spec applies to all sizes unless listed separately

Frameset
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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
*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
Shock SR Suntour Edge R, 190mm x 45mm
Max compatible fork travel 120mm (XS & S: 520mm axle-to-crown, M & up: 545mm axle-to-crown)
Wheels
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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
Skewer rear Bontrager Switch thru axle, removable lever
Rim Alex MD35, tubeless compatible, 32-hole, 35mm width, presta valve
Spokes 14g stainless steel
*Tire Size: XS , S
Bontrager XR3 Comp, wire bead, 30tpi, 27.5x2.35''
Size: M , XL
Bontrager XR3 Comp, wire bead, 30tpi, 29x2.30''
Rim strip Bontrager TLR
Max tire size Frame: 29x2.40" (XS & S: 27.5x2.60") Fork: See manufacturer
Drivetrain
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Shifter Shimano Deore M4100, 10 speed
Rear derailleur Shimano Deore M5120, long cage
Crank FSA Bosch CK-220, 36T ring, 165mm length
Chainring FSA, 36T, steel
Cassette Shimano Deore M4100, 11-46, 10 speed
Chain KMC X10, 10 speed
Pedal VP-536 nylon platform
Max chainring size Max: 46T, Min 34T
Components
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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
Handlebar Bontrager alloy, 31.8mm, 15mm rise, 720mm width
Grips Bontrager XR Trail Comp, nylon lock-on
*Stem Size: XS , S
Bontrager alloy, 31.8mm, Blendr compatible, 7 degree, 60mm length
Size: M , L , XL
Bontrager alloy, 31.8mm, Blendr compatible, 7 degree, 70mm length
Headset FSA IS-2
Brake rotor Tektro, 6-bolt, 203mm
Brake Set Tektro HD-M275 hydraulic disc
Accessories
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Battery Bosch PowerTube 500Wh
Charger Bosch compact 2A, 100-240V, smart system
Motor Bosch Performance CX, magnesium motor body, 250 watt, 85 Nm, 20mph or 32km/h max assist
Computer Bosch Purion
Fender Trek Powerfly 29'' custom fender
Weight
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Weight M - 24.83 kg / 54.75 lbs
Weight limit This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 300 pounds (136 kg).

We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colors, materials, and pricing. Due to supply chain issues, compatible parts may be substituted at any time without notice.

Bike and frame weights are based off pre-production painted frames at time of publication. Weights may vary in final production.

Sizing

Size Rider Height Inseam
XS

145 - 155 cm

4'9" - 5'1"

69 - 73 cm

27" - 29"

S

155 - 165 cm

5'1" - 5'5"

74 - 78 cm

29" - 31"

M

165 - 176 cm

5'5" - 5'9"

79 - 83 cm

31" - 33"

L

177 - 188 cm

5'10" - 6'2"

84 - 89 cm

33" - 35"

XL

188 - 195 cm

6'2" - 6'5"

89 - 91 cm

35" - 36"

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