Powerfly 4 | Trek Bikes (CA)

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

Smaller frames (S) have a top tube that dips down as it approaches the seat tube. This design makes for a lower standover height, which is good for shorter riders because it allows them to straddle their bike more easily. Larger frames (M and up) have a straight top tube because taller riders with longer legs typically don’t have the same issues with standover height.

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.

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.

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This unique protection shield made of lightweight but robust aluminium protects the motor against stones.

Going for a long ride? Rack mounts make carrying accessories a breeze.

The bike is already internally wired to accept additional lights. Go to your dealer and simply have them attached to the bike and plug them in.

The right wheel size paired with your frame size gives you the perfect combination of responsiveness and control.

Our premium lightweight aluminum is continuously cold extruded and butted at multiple points, and hydroformed into sophisticated tube shapes for maximum strength and minimum weight.

Chainstay mounts make it easy to install a rear kickstand that stays out of your way and supports bikes of all sizes. No more laying or leaning.

*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
*Fork	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

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, black
*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"

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

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 - 23.67 kg / 52.18 lbs (with tubes)
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, and materials.

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

The charts below show our recommended sizes based on height, but there are some other factors, like arm and leg length, that determine a great fit. That’s why you’ll see some overlap in our recommendations. Not every rider who’s 5´8˝, for example, will fit on the same size bike. The best way to find your perfect fit is to consult the experts at your local retailer.

Rider Height

Inseam

137.0 - 155.0 cm

4'5.9" - 5'1.0"

64.0 - 73.0 cm

25.2" - 28.7"

153.0 - 166.5 cm

5'0.2" - 5'5.6"

72.0 - 79.0 cm

28.3" - 31.1"

161.0 - 175.0 cm

5'3.4" - 5'8.9"

76.0 - 82.0 cm

29.9" - 32.3"

174.0 - 188.0 cm

5'8.5" - 6'2.0"

82.0 - 88.0 cm

32.3" - 34.6"

186.0 - 196.0 cm

6'1.2" - 6'5.2"

87.0 - 92.0 cm

34.3" - 36.2"

All measurements provided in cm unless otherwise stated.

Frame size number	Frame size letter	Wheel size	A — Seat tube	Effective seat tube angle	C — Head tube length	D — Head angle	E — Effective top tube	F — Bottom bracket height	G — Bottom bracket drop	H — Chainstay length	I — Offset	J — Trail	K — Wheelbase	L — Standover	M — Frame reach	N — Frame stack
14.5	XS	27.5"	36.3	73.5°	13.0	68.5°	57.0	29.1	6.5	45.5	4.4	9.5	109.9	70.7	39.0	60.7
15.5	S	27.5"	39.4	71.6°	13.0	67.6°	59.8	30.7	4.9	45.5	4.4	10.1	112.5	72.9	39.0	62.3
17.5	M	29"	41.9	71.5°	13.0	67.7°	61.8	32.5	4.8	45.5	4.4	10.7	115.9	79.6	40.4	64.0
19.5	L	29"	47.0	71.6°	14.0	67.6°	64.2	32.5	4.9	45.5	4.4	10.7	117.4	81.7	42.5	64.9
21.5	XL	29"	52.1	71.6°	16.0	67.6°	67.3	32.5	4.9	45.5	4.4	10.7	120.6	82.0	45.0	66.8

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Features

Motor Armor

Rack mounts

Lighting ready

Smart Wheel Size

Alpha Platinum Aluminum

Rear kickstand mount

Specifications

Sizing & fit