Powerfly 4 is our most affordable electric mountain bike. It's built with parts that hold up, like a dependable 9-speed Shimano drive train, a 120 mm SR Suntour fork and a powerful Bosch Performance CX 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 trail 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 lightweight and durable Alpha Platinum Aluminium frame that fully encases a long-range 500 Wh battery for sleek looks and protection on the trail, a Bosch Performance CX (250 W, 75 Nm) motor that assists up to 25 km/h, an ergonomic Bosch Purion controller, a Shimano drive train, a 120 mm SR Suntour XCR fork with lockout and hydraulic disc brakes. Plus, Smart Wheel Sizing means you'll get the fastest wheel that fits – 29˝ wheels on larger frames, 27.5˝ wheels on smaller frames.
The final word
Our most affordable electric mountain bike is equipped with performance parts, a high-end Bosch motor, powerful battery and intuitive controller for confidence and a fun boost on trails and roads.
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
It rides like a trail bike because it is one: Powerfly is built according to Trek's trail heritage with mountain bike tech developed over decades of innovation
Features
Bosch Performance Line CX
Bosch's Performance Line CX motor is made specifically for off-road use with more torque and power for better acceleration. The intelligent eMTB mode automatically adjusts the amount of assist to match the terrain. It's a set-and-forget mode that delivers just the right amount of power. You get optimum control, traction and battery life so you can focus on enjoying the ride.
New Bosch Performance Line CX
The all-new Bosch Performance Line CX motor is lighter, smaller and quieter than previous versions, for cleaner integration and more nimble handling. It’s also more efficient so you can go further on a single battery charge. Use the intelligent eMTB mode to automatically adjust the amount of assist to match the terrain. It’s a set-and-forget mode that delivers just the right amount of power so you can focus on enjoying the ride.
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.
Specifications
Frameset
Frame
Alpha Platinum Aluminium, Removable Integrated Battery (RIB), tapered head tube, Control Freak internal routing, Motor Armour, Boost148, 12 mm thru axle
Fork
SR Suntour XCM 34, coil spring, preload, lockout, tapered steerer, 44 mm offset, Boost110, 15 mm thru axle, 120 mm travel
Wheels
Front hub
Formula DC-511, 6-bolt, Boost110, 15 mm thru axle
Rear hub
Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148, 12 mm thru axle
Rims
Bontrager Connection, double-wall, 32-hole, 20 mm width, Presta valve
Tyres
Bontrager XR3 Comp, wire bead, 30 tpi, 29x2.30"
Drivetrain
Shifters
Shimano Altus M2010, 9-speed
Rear derailleur
Shimano Acera M3000, Shadow design, long cage
Crank
FSA 310, 36 T w/chain guard
Cassette
Shimano HG200, 11-36, 9-speed
Chain
KMC E9S, 9-speed
Pedals
VP-536 nylon platform
Components
Saddle
Bontrager Arvada, steel rails
Seatpost
Bontrager alloy, 31.6 mm, 12 mm offset
Handlebar
Bontrager alloy, 31.8 mm, 15 mm rise
Grips
Bontrager XR Endurance Comp
Stem
Bontrager alloy, 31.8 mm, Blendr-compatible, 7-degree
Head set
FSA IS-2, 1-1/8" top, 1.5" bottom
Brake set
Tektro HD-M275 hydraulic disc
Accessories
Battery
Bosch PowerTube, vertical, 500 wh
Controller
Bosch Purion
Motor
Bosch Performance CX, 250 Watt, 75 Nm, 25 km/h max assist
Weight
Weight limit
This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).
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 on Trek pre-production painted frames at the time of publication. Weights may vary in final production
Buy Trek Powerfly 4 EU 2020 Electric Mountain Bike online and collect from our Norwich, Kings Lynn or Gorleston Bike shop