Guide to Triathlon Bikes

The triathlon bike is a more aerodynamic variant of the road bicycle. Its special handlebars (called tri-bars or aero-bars), aerodynamic wheels, and other aerodynamic components reduce wind resistance.  The aero-bars have a smaller pair of horns that reach out to the sides. Its bars stretch forward from the neck of the bike (unlike regular curved drop bars seen in most road bicycles).  This design allows for elbow-rest cycling that makes the transition from cycling to running comfortable.

The triathlon bike is designed with a specialized “aggressive” geometry that includes an almost vertical steep seat-tube angle and a low neck relative to the saddle. This geometry lowers the triathletes' torsos to create a lower wind profile and preserves the muscles for the running portion. The triathlon bike can have a frame tube with a teardrop or an oval cross-section instead of a circular one. Its handlebars are flat instead of round, and its wheels usually have fewer spokes. 

Triathlon bikes help strengthen and condition the muscles. They features a higher cadence or revolutions per minute that keeps the muscles loose and flexible for running.