Aluminum Alloy electric City Bike Low noise and no pollution,Light weight,high quality Gained CE,EN15194 certificate Electric system: MotorHigh speed brushless, ... from 8FUN -180-250WBattery36V / 10 Ah Li-ion .- with electric protection circuit.PAS1:1 pedal assistant system . Speed sensor.- Throttle ... / Rear rack / Chain wheel / Crank / Pedal etc. All in aluminum alloy. electric bicycle