Antics carry a great range of contemporary Electronic Speed Controllers for Radio Controlled Cars. When choosing a speed controller it is important to ensure that the quoted motor limit is suited to the motor you intend to run, as a motor with a lower number of turns than the recommended limit will make the controller heat up very quickly and could cause a failure. If you intend to run a motor below 21turns you will want to improve the efficency of your car with a Ball Race Bearings Setand heavier duty connectors such as the deans type. Most Tamiya and Ansmann cars are supplied with a speed controller suited to 21 turn motors, fitting a faster motor will require an upgrade speed controller.