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Unicycle
A unicycle is a one-wheeled human powered vehicle. Unicycles are
similar to, but less complex than, bicycles.
A Torker Unicycle
Construction
Unicycles are composed of a few key parts: the wheel (which includes
the tire, tube, rim, spokes, hub and axle), the cranks, pedals, fork-style frame, seatpost, and saddle (the seat of the unicycle). The wheel is
usually similar to a bicycle wheel with a special hub designed so the axle is a fixed part of the hub. This means the rotation of the cranks
directly controls the rotation of the wheel (called direct drive). The frame sits on top of the axle bearings, while the cranks attach to the ends of
the axle. The seatpost links the frame to the saddle.
 There are many different types of unicycles, which can include (but are not limited to): freestyle
unicycles, trial unicycles, MUnis, giraffes, and long distance unicycles, which all have special components unique to that type of unicycle.
Article Source: Wikipedia
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