The Motorized Monocycle called Wheelsurf propels a single rider up to 25 MPH and can be purchased at hammacher.com. The wheel operates by using a centrifugal clutch on its inner steel frame to engage the larger outer flywheel that actually makes contact with the ground with a rubber tire.

The ingenious device is steered by leaning to one side or the other, and it can safely negotiate any dense surface such as pavement or grass. A fiberglass frame encloses the engine, drive train, and fuel tank, and provides a cushioned seat and convenient footrests for riders.

It´s sure nice to ride, just keep in mind that it´s not a street-legal vehicle.