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Selling Fun for 25 Years
Trek Powerfly FS 4 (2021) Lithium Grey/Trek Black
Powerfly 4 is Trek's 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 Trek's user-friendly Removable Integrated Battery (RIB) system, which
Powerfly 4 is Trek's 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 Trek's user-friendly Removable Integrated Battery (RIB) system, which is 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, 75 Nm) motor that assists up to 32km/h, a Bosch Purion controller, a 1x10 Shimano drivetrain, an 80mm 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
Trek's most affordable electric mountain bike comes with the same powerful Bosch motor and intuitive controller as the company's most expensive e-bikes, with a smaller battery and parts chosen to give you great value.
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 to 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 e-MTB 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
|Front Hub||Formula DC-511, 6-bolt, Boost110, 15mm thru axle|
|Rear Hub||Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148, 12mm thru axle|
|Rims||Bontrager Connection, double-wall, 32-hole, 20mm width, presta valve|
|Shifters||Shimano Deore M4100, 10 speed|
|Rear Derailleur||Shimano Deore M5120, long cage|
|Crank||FSA Bosch CK-220, 36T ring, 165mm length|
|Cassette||Shimano Deore M4100, 11-46, 10 speed|
|Chain||KMC X10, 10 Speed|
|Pedals||VP-536 nylon platform|
|Saddle||Bontrager Commuter Comp, 165mm width|
|Seatpost||Bontrager alloy, 31.6mm, 12mm offset, 400mm length|
|Handlebar||Bontrager alloy, 31.8mm, 15mm rise, 750mm width|
|Stem||Bontrager alloy, 31.8mm, Blendr compatible, 7 degree, 70mm length|
|Grips||Bontrager XR Endurance Comp, lock-on|
|Headset||FSA IS-2, 1-1/8" top, 1.5" bottom|
|Brakeset||Tektro HD-M275 hydraulic disc, 203mm rotors|
|Battery||Bosch PowerTube 500|
|Motor||Bosch Performance CX, magnesium motor body, 250 watt, 75 Nm, 20mph or 32km/h max assist|
|Weight||M - 23.67kg / 52.18lbs (with tubes)|
|Frame||Alpha Platinum Aluminium, Removable Integrated Battery (RIB), tapered head tube, Control Freak internal routing, Motor Armour, Boost148, 12mm thru axle|
|Tyres||Bontrager XR3 Comp, wire bead, 30tpi, 29x2.30"|
|Fork||SR Suntour XCM 34, coil spring, preload, lockout, tapered steerer, 44mm offset, Boost110, 15mm thru axle, 120mm travel|
*All specifications listed are subject to change without notice.