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handcycle
A handcycle is a type of human-powered land vehicle powered by the arms rather than the legs, as on a bicycle. Most handcycles are tricycle in form, with two coasting rear wheels and one steerable powered front wheel. Despite usually having three wheels, they are also known as ''handbikes''.
==Description==
Many manufacturers have designed and released hand-powered recumbent trikes, or handcycles. Handcycles are a regular sight at HPV meets and are beginning to be seen on the streets. They commonly follow a delta design with front wheels driven by standard derailleur gearing powered by hand cranks. Brake levers are usually mounted on the handholds which are usually mounted in phase, unlike pedal cranks, which are usually 180° out of phase. This allows the rider to more easily use their torso to help propel the cycle. The entire crank assembly and the front wheel turn together, allowing the rider to steer and crank simultaneously.
Some designs use two front wheels and a single rear wheel, while others use lean-steer designs.
A handcycle is not a wheelchair, handcycle has a crank and gears, while a wheelchair has push-rims directly on the main wheels.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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