The more teeth, the faster the flywheel will turn, and the fewer teeth, the slower the flywheel will turn. In addition, the smaller the flywheel, the more labor-saving it is, and the larger the flywheel, the more labor-intensive it is; the smaller the chainring, the easier it is to climb to the lowest gear, and the larger the chainring, the faster the speed in the highest gear; there are two types of gears in mainstream electric motors. Type: There are geared hub motors and gearless hub motors.