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. Frame Size: S. Alpha Platinum Aluminium, curved top tube, Removable Integrated Battery (RIB), tapered head tube, Control Freak internal routing, Motor Armour, Boost148, 12 mm thru axle. Size: M , L , XL. 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. Max compatible fork travel 120mm (526mm axle-to-crown), XS: 80mm (492mm axle-to-crown). Wheels. 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. *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". Max tyre size Frame: 29x2.60" or 27.5x2.80" (XS & S: 27.5x2.60"), Fork: See manufacturer. Drivetrain. Shifter Shimano Deore M4100, 10 speed. Rear derailleur Shimano Deore M5120, long cage. Crank FSA Bosch CK-220, 36T ring, 165 mm length. Chainring FSA, 36T, steel. Cassette Shimano Deore M4100, 11-46, 10-speed. Chain KMC X10, 10-speed. Pedal VP-536 nylon platform. Max. chainring size 1x: 38T. Components. Saddle Bontrager Commuter Comp. *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. Size: L , XL. Bontrager alloy, 31.6 mm, 12 mm offset, 400 mm length. *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. *Grips Size: S , M , L , XL. Bontrager XR Endurance Comp, lock-on. Size: S , M , L , XL. Bontrager XR Endurance Comp. *Stem Size: S , M. Bontrager alloy, 31.8 mm, Blendr-compatible, 7-degree, 60 mm length. Size: L , XL. Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 70 mm length. Head set FSA IS-2, 1-1/8" top, 1.5" bottom. Brake rotor Tektro, 6-bolt, 203 mm. Brake Set Tektro HD-M275 hydraulic disc. Rotor size Max brake rotor sizes - Frame: 203mm, Fork: see fork manufacturer. Accessories. Battery Bosch PowerTube 500 Wh, smart system. Charger Bosch standard 4A, 230V, smart system. Controller Bosch Intuvia 100, smart system. Motor Bosch Performance Line CX, smart system, magnesium motor body, 85 Nm. Computer Bosch LED remote, smart system. Weight. Weight M - 23.94 kg / 52.78 lbs. Weight limit This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).