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A time trial bicycle is a racing bicycle designed for use in an individual or team time trials raced on roads. Special time trial bikes also exist for use in a velodrome. Since the cyclist in a time trial is not permitted to draft〔UCI Rule book page 35 http://www.uci.ch/Modules/BUILTIN/getObject.asp?MenuId=MTkzNg&ObjTypeCode=FILE&type=FILE&id=34028&LangId=1〕 (ride in the slipstream) behind other cyclists, reducing aerodynamic drag of the bicycle and rider is critical. One difference between a time trial bicycle and a road bicycle is the use of triathlon handlebars or aerobars. The main part of the bullhorns curves forward (like a road handlebar), but where the road handle bar curves down, the time trial bar ends. This provides a low tucked position that is aerodynamic while providing good stability. The time trial bar also uses a "clip on" bar or aerobar which attaches to the main bar near the stem and provides a position where the hands and fore-arms are close together, low and forward, providing a very aerodynamic (though less stable) position. The aerobar became popular when in 1989 Greg LeMond made up 50 seconds to defeat Laurent Fignon (the race leader) in the final stage (and final time trial) of the Tour de France. Time trial races tend to be much shorter than road races, so comfort is less of an issue. Also, control of the bike is less important, since there is little chance of bumping another rider and the courses tend to be less technical with little hill climbing, turns or descents. == Differences from road bicycles== Differences from road bicycles include: * Higher gearing. Since time trial races are relatively short, the rider can ride at a higher pace. * Deep rim or disk wheels, which are more aerodynamic. * The tubing of the frame may be shaped like an airfoil to make it more aerodynamic. * The top tube is usually a couple of centimeters shorter to give an adequate stem length when riding on aerobars. * Since time trials are usually flat, more emphasis is placed on aerodynamics than weight and handling. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Time trial bicycle」の詳細全文を読む スポンサード リンク
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