The Flywheel Gear is a carbon steel ring with teeth fitted to the flywheel that is engaged by the starter gear to transfer torque and begin the engine cycle. It is made to last; however, the teeth can still wear down or break. A flywheel is a machine that reserves rotational energy by resisting changes in rotation speed. The flywheel in cars with its weight helps counter this wobbly motion, helping the engine on its mounts to be stabilized and balanced. The Flywheel Gear is a mechanical switch, a clutch allows a car to disengage itself from its engine.