Racing bicycles are designed to do one thing-go fast. To that end, there are two important characteristics to this kind of bike. One, it is light weight, which means that the cyclist has to put in less effort to propel the bicycle; and two, its makeup is as aerodynamic as possible, up to and including the position assumed by the cyclist. It is the combination of these two attributes that allows the racing cyclists to attain the speeds they do for the amount of time required.

Every component of a racing bicycle is designed to weigh as little as possible. The wheel rims, for example are usually made of aluminum alloy, a very lightweight material. Alternatively, some bicycles have carbon fiber rims, which weigh even less. Most such rims have triangular cross-sections, which allow for greater aerodynamic efficiency. To further reduce weight and increase aerodynamics, many racing bicycle wheels have as few spokes possible. Some high-end wheels have spokes with bladed cross-sections, which further reduce wind resistance. The tires of racing bicycles are lightweight, narrow and have a thin, smooth tread. They are inflated to a very high pressure, which increases the potential speed of the bike.

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