This product belongs hub motor. It is high speed in the hub motor the max speed can reach 1000rpm when it without heavy. And the motor is not heavy,only 3.3 kilograme,so it is easy to move and can coorperate with the bicycle well. If you are interested in our product,please contact us. We will... https://www.tzbotautomation.com/...cle-motor-hub-motor.html