The UCI rules currently specify that a racing bicycle have the following characteristics:

• be a vehicle with a front wheel steered by a handlebar and a rear wheel driven by a system comprising pedals and a chain by the legs moving in a circular movement
• wheels must be of equal diameter, between 70 cm and 55 cm, and must have minimum 12 spokes
• maximum length 185 cm
• maximum width 50 cm
• the peak of the saddle must be at least 5 cm behind a vertical plane passing through the bottom bracket spindle
• the saddle must be between 24 cm and 30 cm in length
• the distance between the bottom bracket spindle and the ground must be between 24 cm and 30 cm
• the distance between the vertical passing through the lower bracket spindle and the front wheel spindle must be between 54 cm and 65 cm
• the distance between the vertical passing through the bottom bracket spindle and the rear wheel spindle must be between 35 cm and 50 cm
• the maximum internal distance between the front fork ends is 10.5 cm, and of the rear stays 13.5 cm
• minimum mass 6.8 kg (15 lb)
• frame must be built around a main triangle, constructed of tubular elements (that may have non-circular cross-sections) such that the form of each encloses a straight line

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