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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.
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.
| Frame | Alpha Platinum Aluminium, Removable Integrated Battery (RIB), tapered head tube, Control Freak internal routing, Motor Armor, Boost148 |
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| 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 |
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| 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 |
| *Tyre | Size: S Bontrager XR3 Comp, wire bead, 30 tpi, 27.5x2.35" |
| Size: M , L , XL Bontrager XR3 Comp, wire bead, 30 tpi, 29x2.30" |
| Shifter | Shimano Deore M4100, 10 speed |
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| 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 |
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| *Seatpost | Size: S Bontrager alloy, 31.6 mm, 12 mm offset, 330 mm length |
| Size: M Bontrager alloy, 31.6 mm, 12 mm offset, 360 mm length |
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| Size: L , XL Bontrager alloy, 31.6 mm, 12 mm offset, 400 mm length |
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| *Handlebar | Size: S 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 |
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| 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 |
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| 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, vertical, 500 wh |
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| Charger | Bosch compact 2A (100-240 V) charger |
| Controller | Bosch Purion |
| 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 - 23.67 kg / 52.18 lbs (with tubes) |
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| Weight limit | This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb). |