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BicycleA bicycle is a small land vehicle with two tandem wheels (hence the name) powered by a seated human rider (occasionally more than one - see variations below) -- in other words a pedal vehicle. Cycling or riding bicycles is one of the principal forms of transportation in several parts of the world. It is also a common recreation and popular sport.
The bicycle is the most energy efficient means of transport known to man. It has been calculated that, in terms of converting food energy to motion, a bicycle is the most efficient form of locomotion found anywhere in biology. The bicycle is the most technically efficient transportation machine ever invented, in terms of the ratio of distance travelled to the calories of energy spent to achieve that distance. The bicycle is the most efficient cargo transportation machine ever invented, as defined as the ratio of maximum transported cargo weight to total weight. Typical speeds for bicycles are 16 to 32 km/h (10 to 20 mph). On a really fast racing bicycle, a reasonably fit rider can ride at 30 mph or 50 km/h on the flat for short periods. The highest speed ever attained on the flat, without riding behind a wind-block, is by Canadian Sam Whittingham, who in 2001 set a 80.55 mph or 142.51 km/h record on his highly aerodynamic recumbent bicycle. This stands as the record for all human-powered vehicles.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Bicycle" and from http://www.treadly.com
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