Powerfly 4 is our most affordable electric mountain bike. It's built with parts that hold up, like a smooth-shifting Shimano drive train, 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 that you never thought you'd reach on a mountain bike.
It's right for you if...
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 that an e-MTB with the latest user-friendly tech is the best way to get them.
The tech you get
A tough yet refined aluminium frame that fully encases a long-range 500 Wh battery for sleek looks, a Bosch Performance CX (250 W, 85 Nm) motor that assists up to 20 mph or 32 km/h, a Bosch Purion controller, a 1x10 Shimano drive train, an SR Suntour fork with lockout and hydraulic disc brakes. Plus, Smart Wheel Sizing means riders of every size get a great fit – 29˝ wheels on larger frames, 27.5˝ wheels on smaller frames.
The final word
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.
*spec applies to all sizes unless otherwise noted
|Frame||Alpha Platinum Aluminium, Removable Integrated Battery (RIB), tapered head tube, Control Freak internal routing, Motor Armor, Boost148|
|Fork||SR Suntour XCM 34, coil spring, preload, lockout, tapered steerer, 44 mm offset, Boost110, 15 mm thru axle, 120 mm travel|
|Hub front||Formula DC-511, 6-bolt, Boost110, 15 mm 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, 20 mm width, Presta valve|
|Spokes||14 g stainless steel|
Bontrager XR3 Comp, wire bead, 30 tpi, 27.5x2.35"
|Size: M , L , XL
Bontrager XR3 Comp, wire bead, 30 tpi, 29x2.30"
|Max tyre size||Frame: 29x2.60" or 27.5x2.8" (XS & S: 27.5x2.60") Fork: See manufacturer|
|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|
|Saddle||Bontrager Commuter Comp|
Bontrager alloy, 31.6 mm, 12 mm offset, 330 mm length
Bontrager alloy, 31.6 mm, 12 mm offset, 360 mm length
|Size: L , XL
Bontrager alloy, 31.6 mm, 12 mm offset, 400 mm length
Bontrager alloy, 31.8 mm, 15 mm rise, 720 mm width
|Size: M , L , XL
Bontrager alloy, 31.8 mm, 15 mm rise, 750 mm width
|Grips||Bontrager XR Endurance Comp|
|*Stem||Size: S , M
Bontrager alloy, 31.8 mm, Blendr-compatible, 7-degree, 60 mm length
|Size: L , XL
Bontrager alloy, 31.8 mm, Blendr-compatible, 7-degree, 70 mm length
|Head set||FSA IS-2, 1-1/8" top, 1.5" bottom|
|Brake||Tektro HD-M275 hydraulic disc|
|Brake rotor||Tektro, 6-bolt, 203 mm|
|Battery||Bosch PowerTube 500|
|Charger||Bosch compact 2A (100-240 V) charger|
|Motor||Bosch Performance CX, magnesium motor body, 250 watt, 85 Nm, 25 km/h (15.5 mph) max assist, 32 km/h for New Zealand|
|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 136 kg (300 lb).|
Why you'll love it
- 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 mudguards, plus built-in wiring lets you easily install lights powered by the motor