新的螺栓磁盘刹车后面自行车运动

new bolted disc brake rear bicycle motor feature: one side for bolted disc brake and other for 1-7gears freewheel 1.can install different size of spoken and wheel 2.wide application for ebike ,tricycle ,E-vehicle 3.hgih torque special for moutain biycle 4.rated power:180-800w 5.rated voltage:24-36-48-60-72v 6.different colour can be accepted :black /silve 7.can do as custmer's request ,including speed and torque