A racing bicycle is a bicycle designed for road cycling according to the rules of the Union Cycliste Internationale (UCI). The UCI rules were altered in 1934 to exclude recumbent bicycles. Throughout the late 1990s the rules were altered regularly to outlaw innovations.
The two most important things about a racing bicycle are its light weight and the aerodynamic efficiency of the rider's position. The drop handlebars are positioned lower than the saddle in order to put the rider in a more aerodynamic posture. The front and back wheels are close together so the bicycle has quick handling. The derailleur gear ratios are closely-spaced so that the rider can pedal at his or her optimum cadence.
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