Electric bicycle kit 36XF07-AW-F(36V,9AH) 12-28'' ... 12"-28"700C25KG24v KIT 12"-28"700C7-10KG36v KIT 12"-28"700C7-10KG48v KIT 7-1OKG Electric system MotorFront/rear ... wheel,light,high speed,brushlessGreat hub motor,16''-28i'' wheel optional.DISC brake ... system for display ,throttle,brakepasnew design controller electric bicycle kit