Wikipedia
Cycling
Cycling is an activity most commonly performed on a bicycle - when it is it is also referred to as bicycling or simply biking. It is the use of the bicycle, unicycle (unicycling), tricycles (tricycling), quadracycles (quadracycling), and other similar wheeled human-powered vehicles (HPVs) for the purpose of transport, as a form of recreation, or in racing. It is done on roads and paths, across open country or even over snow and ice (icebiking).
Bicycles were introduced in the 19th century and now number about one billion worldwide.DidYouKnow.cd. . Retrieved 30 July 2006. They are the principal means of transportation in many regions.
Bicycling is a highly efficient mode of transportation and optimal for short to moderate distances. Compared to motor vehicles, bicycles have numerous benefits including the provision of exercise, generating renewable energy and thus no air pollution, reducing traffic congestion, minimizing noise pollution (nearly silent operation), easier and less costly parking, much lower likelihood of causing a fatality, high maneuverability, ability to travel on roads or special paths, and lower user cost as well as societal costs (negligible damage to roads, and less pavement required). Criticisms and downsides to cycling commonly include: reduced protection in crashes (including those with motor vehicles), longer travel time (except in densely populated areas), no inherent protection from poor weather, difficulty in transporting passengers, and the physical demands of operation.
History
Equipment
In many countries, the most commonly used vehicle for road transport is a utility bicycle. These have frames with relaxed geometry, protecting the rider from shocks from the road, and easing steering at low speeds.
Road bikes tend to have a more upright shape and a shorter wheelbase, which make the bike more mobile but harder to ride slowly. The design, coupled with low or dropped handlebars, requires the read more at » http://en.wikipedia.org/wiki/Cycling