Small size, low heat generation, multiple protections; high efficiency, multiple speed regulation, large torque. Motor: within the rated speed, if there is no overload, the torque is basically unchanged. The motor can be adjusted forward and reverse for a long time without being affected. Small size, does not take up space. Motor length L (mm):130. Center hole distance: 65. Mounting hole: 6mm through hole. 1x 650W High voltage 80 brushless motor + 1x reducer + 1x controller. If you want other speed and gearbox ratio, pls kindly free contact to us. Please check with y. We are not responsible. OR, you may choose to have a replacement. Our aim is to provide Top Level Customer Service, normally so we will try our best to solve any problem you have. Please DON’T leave negative or neutral feed.