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 50km/h. 5. The open size of the front fork is 100mm 6. Thumb Throttle 7. The size of the rim is 20", suitable for 20 inch bike. 8. Crank speed sensor for pedal assist.