Bicycle
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A bicycle, also called a pedal cycle, bike, push-bike or cycle, is a human-powered or motor-assisted, pedal-driven, single-track vehicle, with two wheels attached to a frame, one behind the other. A bicycle rider is called a cyclist, or bicyclist.
The most popular bicycle model—and most popular vehicle of any kind in the world—is the Chinese Flying Pigeon, with about 500 million produced.
Women on bicycles on unpaved road, US, late 19th century
A penny-farthing or ordinary bicycle photographed in the Škoda Auto museum in the Czech Republic
The Svea Velocipede by Fredrik Ljungström and Birger Ljungström, exhibited at the Swedish National Museum of Science and Technology
Human-powered transport
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Human-powered transport is the transport of person(s) and/or goods (freight) using human muscle power. Unlike animal-powered transport, human-powered transport has existed since time immemorial in the form of walking, running and swimming, as well as small vehicles such as litters, rickshaws, wheelchairs and wheelbarrows. Modern technology has allowed mechanical advantage devices and machines to enhance human-power.
Sherpa carrying wood to Mount Everest base camp
Shopping trolley
Skateboards are propelled by pushing (one foot riding on board, one foot pushing on ground) or by gravity
Trikkes are powered by shifting the rider's body weight