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A monowheel or uniwheel is a type of one-wheeled, single-track vehicle. Unlike the unicycle, a monowheel consists of a large, hollow wheel that loops above and around the driver. Monowheels are typically powered by an engine as with a motorcycle, with a chassis securing the steering, driver's seat, and propulsion mechanism to the interior of the wheel.
Hand-cranked[2] and pedal-powered monowheels were patented[3] and built in the late 19th century; most built in the 20th and 21st century have been motorized. Some modern builders refer to these vehicles as monocycles, though that term is also sometimes used to describe motorized unicycles.
A world speed record for a motorized monowheel was set in 2016, at 98.464 km/h (61.18 mph).[4]