A stabilizing device for radio-controlled motorcycles comprises a wheel of a motorcycle which is mounted so that it can rotate on a wheel rotation pivot and a flywheel which is also mounted so that it can rotate on the wheel rotation pivot. The device comprises an electric motor which has a rotor which is rigidly coupled to the flywheel and a stator which is rigidly coupled to the wheel rotation pivot. The device further comprises a speed regulator for the electric motor which can be radio-controlled.