Impossible wheel
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The impossible wheel, also known as the BC wheel (after the comic strip B.C.), represents the most basic type of unicycle, consisting of a single spoked wheel with pegs extending from the axle. The rider mounts the wheel by jumping onto it while in motion. This contraption has no pedals, so when the wheel's inertia runs out due to gravity and friction, the ride ends.
External link
Riding the Impossible Wheel (http://www.devilstick.org/~jbarlow/juggling/impossible.html)