Editing Triathlon (section)

===Cycling===
{{see also|Bicycle racing}}
[[File:Triathlete on bike.jpg|thumb|upright|Triathlete in the cycling portion of the event]]
Triathlon cycling can differ from most professional bicycle racing depending on whether [[Drafting (aerodynamics)|drafting]] is allowed during competition. In some competitions, like those governed by USA Triathlon and the World Triathlon Corporation, drafting is not allowed,<ref name="USAT Rules" /> and thus the cycling portion more closely resembles [[individual time trial]] racing. In other races, such as those in the [[World Triathlon Series]] and [[World Triathlon Cup]] racing, drafting and the formation of [[peloton]]s are legal.<ref name="Garrett"/><ref name="ITU Rules" /> This places an emphasis on running performance as several athletes will enter the bike to run transition at the same time due to drafting.<ref name="Friel">{{cite book|last=Friel|first=Joe|title=The Triathlete's Training Bible|year=2004|publisher=VeloPress|isbn=978-1-931382-42-7|url=https://archive.org/details/triathletestrain00joef_0}}</ref>

Triathlon bicycles are generally optimized for aerodynamics, having special handlebars called [[Triathlon bars|aero-bars or tri-bars]], [[Disc wheels|aerodynamic wheels]], and other components. Triathlon bikes use a specialized geometry, including a steep [[Bicycle frame#Seat tube|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 (cycling)|cadence]] (revolutions per minute), which serves in part to keep the muscles loose and flexible for running.