{{Short description|Racing bicycle}} [[File:Bornem - Ronde van België, proloog, individuele tijdrit, 27 mei 2015 (A061).JPG|thumb|Time trial bikes used by the {{UCI team code|AST|2015}} team in 2015]]
A '''time trial bicycle''' is a [[racing bicycle]] designed for use in an [[individual time trial|individual race]] against the clock. Compared to a road bike, a time trial bike is more [[aerodynamic]], has a shorter wheelbase, and puts the rider closer to the front of the bicycle. It may have either a solid disc or spoked wheels.<ref>{{Cite book|last1=Liggett|first1=Phil|url=https://books.google.com/books?id=HeBJN_cysjoC&dq=%22time+trial%22+bicycle&pg=PA121|title=Tour De France For Dummies|last2=Raia|first2=James|last3=Lewis|first3=Sammarye|publisher=John Wiley & Sons|date=2005|isbn=978-0-7645-8449-7|pages=121|language=en}}</ref>
Since the [[cycling|cyclist]] in a [[time trial]] is not permitted to [[drafting (racing)|draft]] (ride in the [[slipstream]]) behind other cyclists, reducing the [[Drag (physics)|drag]] of the bicycle and rider is critical.<ref>UCI Rule book page 35 {{cite web|title=PART 2 ROAD RACES|url=http://www.uci.ch/Modules/BUILTIN/getObject.asp?MenuId=MTkzNg&ObjTypeCode=FILE&type=FILE&id=34028&LangId=1|url-status=dead|archiveurl=https://web.archive.org/web/20110623174023/http://www.uci.ch/Modules/BUILTIN/getObject.asp?MenuId=MTkzNg&ObjTypeCode=FILE&type=FILE&id=34028&LangId=1|archivedate=2011-06-23|accessdate=2011-04-29}}</ref>
Time trial bicycles are similar to triathlon bicycles. Triathlon bicycles have a steeper seat tube angle, which pushes the hips forward and saves the hamstrings for the run. TT bicycles have to follow [[Union Cycliste Internationale|International Cycling Union (UCI)]] rules. UCI requires that the saddle nose of the TT bicycle must be 5 cm from the centre of the bottom bracket.<ref>{{Cite web|title=What's the difference between a triathlon bike and a time trial bike?|url=https://www.220triathlon.com/gear/bike/bikes/time-trial-triathlon-bikes/whats-the-difference-between-a-triathlon-bike-and-a-time-trial-bike/|access-date=2021-01-05|website=220 Triathlon|language=en}}</ref> [[Image:Aero seatpost.JPG|thumb|right|An aero [[seatpost]] on an [[Orbea]] Ordu with positions marked "chro" and "tri"]]
== See also == {{Portal|Sports}} * [[Outline of cycling]] * [[Time trialist]]
==References== <references/>{{Cycling-race-stub}}{{Human-powered vehicles}}
[[Category:Cycle types]] [[Category:Road bicycle racing terminology]]