@farzeen There are many factors to sumo robots, of which one is rpm, the other torque, another are the sensors used and then the code. The overall shape will have an impact as well. You would likely use a DC motor, encoder and motor controller. At lower speeds, the motor tends not to be able to provide as much torque as compared to when it’s operating at its rated / max rpm. Some motor manufacturers provide a curve of torque vs. rpm, as well as torque vs current, but unfortunately most do not.