Inc.com reports that the Gyrowheel, which replaces the front wheel of a child’s bike, rights the bike whenever it starts to tip.
How? It contains a motorized spinning disk. In technical terms, the disk creates a force called gyroscopic precession. In practice, it makes a bike really stable at low speeds.
The wheel has three stability levels; as riders improve, they go to the lower levels.
Photo by Gyrobike.