Optimal power/drag ratio. It's what TT speed boils down to. 400 watts of raw power won't push a billboard to a winning time; a rider with the profile of a bullet can't win if his position only allows 140 watts. To win, you have to minimize drag and maximize power. The HED Aerobar comes standard with S-Bend extensions. The S bends were developed in conjunction with and for Lance Armstrong to use in the '04 tour. Available in carbon fiber or aluminum. 2007 model weight is reduced to 699g without sacrificing any stiffness or adjustability. Specifications: Weight: 700g Base bar width: 42cm ctc Clamp size 26.0 Rides choice of extensions Intergraded brake levers