A Gyrobike[1] is a bicycle with a Gyrowheel for its front wheel. The Gyrowheel contains a motor-driven flywheel that spins independently, and uses the principle of gyroscopic precession to help stabilize the bike and the rider. Precession responds to a lean of the bike by turning the front wheel in the direction of the lean, which can help provide stability at low speeds, whether riding straight or turning.
The Gyrobike was invented by a group of four students at Dartmouth College for an engineering project. The Gyrowheel is currently offered in two children's sizes, for 12-inch and 16-inch wheeled bikes, each of which is available in two different color schemes (a white wheel with a yellow flywheel, and a black wheel with a red flywheel). Product development is also underway on an adult-sized Gyrobike intended to provide continuous stability for disabled, elderly or other riders.