"Wheel sucking" is a term used to describe the practice of cycling behind another rider with wheels a few centimeters apart. This practice allows the rider "sucking wheels" to gain an aerodynamic and consequently a physiological advantage by reducing the amount of work done he/she has to do. Some have claimed that this practice allows the "wheel sucking" rider to perform 30% less work. The advantage of "wheel sucking" is magnified when the size of the front rider is large, when there is a considerable headwind and when the front rider is moving at a significant speed > 30 km/h.
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