20 in

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. About the battery: The power and voltage of the battery（not included） you buy should be consistent with our set. When installing, make sure that the wiring is not reversed.Otherwise, it may damage the product. Note: Not waterproof, please do not drive on rainy days Features: 1. 48V 1000W Brushless and toothless motor specification, strong and powerful. 2. Come with powerful controller guarantee big current supply. 3. Suitable for both V brake and Disc brake. 4. The maximum speed of the motor will be 43km/h. 5. The open size of the rear fork is 135mm 6. Thumb Throttle 7.