If it does not match, it will easily damage the machine. PLEASE NOTE:The E-BIKE Wheel Kit is not waterproof, so please don’t ride at rainy day Note: while connecting the controller to the wires, please make sure that you connect the right colors to the controller. Otherwise, the controller may be broken. LCD display can not be connected to this kit. (please give us your LCD parameters) Note: We use the brake cable with a power cord, our clients can use disc brakes but can not use hydraulic brake. About the battery: the size of amps determines the amount of battery stor.