Triathlon cycling can differ from most professional bicycle racing depending on whether drafting is allowed during competition. In some competitions, like those governed by USA Triathlon and the World Triathlon Corporation, drafting is not allowed, the cycling portion more closely resembles individual time trial racing. In other races, such as those in World Cup and Championship racing, drafting and the formation of pelotons are legal. This places an emphasis on running performance as several athletes will enter the bike to run transition at the same time due to drafting.
Triathlon bicycles are generally optimized for aerodynamics, having special handlebars called aero-bars or tri-bars, aerodynamic wheels, and other components. Triathlon bikes use a specialized geometry, including a steep seat tube angle both to improve aerodynamics and to spare muscle groups needed for running. At the end of the bike segment, triathletes also often cycle with a higher cadence, which serves in part to keep the muscles loose and flexible for running. It is believed, though, that the primary benefit to cycling in a triathlon is that the strain of the effort is placed disproportionately on the slow-twitch muscle fibers, preventing the athlete from accumulating an oxygen debt before the run.
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