Motor Type:36v 250wRear Geared Hub MotorBattery Voltage / Amp Hours / Watt Hours:36v / 7.8ah /280.8whBattery Chemistry:Lithium Nickel Cobalt Manganese (Li-ncm)Estimated Charge Time:4-6 hoursEstimated Min And Max Range:26 40 Miles (Depending On Riding Style, Terrain, Rider Weight And Pedal Assist Level.)Drive Modes:Cadence Sensing Pedal Assist, Trigger Throttle, Walk ModeTop Speed:21mph With Pedal Assist, 15-17mph Throttle Only (Depending On Riding Style, Terrain, Rider Weight And Pedal Assist Level.)Frame Material:6061 Aluminum AlloyGearing Details:Shimano TY300 7 SpeedShifter Details:Shimano FT35 7 SpeedFreewheel:Shimano TZ500 14-28TBrake Details:mechanical disc-brake,Wheel Size:20x21.75