Trek Powerfly 4 Radioactive Red/Trek Black

Powerfly 4 is our most affordable electric mountain bike. It's built with parts that hold up, like a smooth-shifting Shimano drivetrain, and a powerful Bosch motor. Plus, it features our user-friendly Removable Integrated Battery (RIB) system that's fully encased in the frame yet doesn't require tools for removal. This bike expands your boundaries and lets you travel to destinations you never thought you'd reach on a mountain bike.

You're sold on the e-bike revolution and want the capability and versatility of a mountain bike at a price that doesn't resemble the car you're trying to use less. You want bigger, better off-road adventures, and know an e-MTB with the latest user-friendly tech is the best way to get them.

A tough yet refined aluminum frame that fully encases a long-range 500Wh battery for sleek looks, a Bosch Performance CX (250W, 75Nm) motor that assists up to 20 mph or 32 km/h, a Bosch Purion controller, a 1x10 Shimano drivetrain, and a suspension fork with lockout. Plus, Smart Wheel Sizing means riders of every size get a great fit—29˝ wheels on larger frames, 27.5˝ wheels on smaller frames.

Our most affordable electric mountain bike comes with the same powerful Bosch motor and intuitive controller as our most expensive e-bikes, with a smaller battery and parts chosen to give you great value.

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 remove the battery without tools and lets you mount a water bottle cage
This bike expands boundaries: the top-notch Bosch system is equally suited to commuting, recreation, and a ridiculously fun time on the trails
The Purion controller has Walk Assist and an intelligent eMTB mode that automatically delivers the right amount of power based on your terrain
It's equipped with an external charging port for easy charging on or off the bike
You can boost your Powerfly’s utility by adding a rack and fenders, plus built-in wiring lets you easily install lights powered by the motor

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, and materials.

*spec applies to all sizes unless otherwise noted

Frameset

Frame	Alpha Platinum Aluminum, Removable Integrated Battery (RIB), tapered head tube, Control Freak internal routing, Motor Armor, Boost148, 12mm thru axle
*Fork	Size: XS SR Suntour XCM 34, coil spring, preload, lockout, tapered steerer, 44 mm offset, Boost110, 15 mm thru axle, 80 mm travel
	Size: S , M , L , XL SR Suntour XCM 34, coil spring, preload, lockout, tapered steerer, 44 mm offset, Boost110, 15 mm thru axle, 120 mm travel
	Size: S , M , L , XL SR Suntour XCM 34, coil spring, preload, lockout, tapered steerer, 44mm offset, Boost110, 15mm thru axle, 120mm travel
Max compatible fork travel	120mm (XS & S: 100mm)

Wheels

Hub front	Formula DC-511, 6-bolt, Boost110, 15mm thru axle
Hub rear	Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148, 12 mm thru axle
Skewer rear	Bontrager Switch thru-axle, removable lever
Rim	Bontrager Connection, double-wall, 32-hole, 20mm width, presta valve
Spokes	14 g stainless steel
*Tire	Size: XS , S Bontrager XR3 Comp, wire bead, 30 tpi, 27.5x2.35"
*Tire	Size: M , L , XL Bontrager XR3 Comp, wire bead, 30 tpi, 29x2.30"
Max tire size	Frame: 29x2.60" or 27.5x2.8" (XS & S: 27.5x2.60") Fork: See manufacturer

Drivetrain

Shifter	Shimano Deore M4100, 10 speed
Rear derailleur	Shimano Deore M5120, long cage
Crank	FSA Bosch CK-220, 36T ring, 165 mm length
Cassette	Shimano Deore M4100, 11-46, 10 speed
Chain	KMC X10, 10 speed
Pedal	VP-536 nylon platform
Max chainring size	38T

Components

Saddle	Bontrager Commuter Comp
*Seatpost	Size: XS , S Bontrager alloy, 31.6mm, 12mm offset, 330mm length
	Size: M Bontrager alloy, 31.6mm, 12mm offset, 360mm length
	Size: L , XL Bontrager alloy, 31.6mm, 12mm offset, 400mm length
*Handlebar	Size: XS , S Bontrager alloy, 31.8mm, 15mm rise, 720mm width
*Handlebar	Size: M , L , XL Bontrager alloy, 31.8mm, 15mm rise, 750mm width
Grips	Bontrager XR Endurance Comp, lock-on
*Stem	Size: XS Bontrager alloy, 31.8mm, Blendr compatible, 7 degree, 50mm length
	Size: S , M Bontrager alloy, 31.8mm, Blendr compatible, 7 degree, 60mm length
	Size: L , XL Bontrager alloy, 31.8mm, Blendr compatible, 7 degree, 70mm length
Headset	FSA IS-2, 1-1/8'' top, 1.5'' bottom
Brake	Tektro HD-M275 hydraulic disc
Brake rotor	Tektro, 6-bolt, 203 mm

Accessories

Battery	Bosch PowerTube 500
Charger	Bosch compact 2A (100-240V) charger
Controller	Bosch Purion
Motor	Bosch Performance CX, magnesium motor body, 250 watt, 85 Nm, 20mph or 32km/h max assist

Weight

Weight	M - 51.52 lbs / 23.37 kg
Weight limit	This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 300 pounds (136 kg).