The Zipp Vuka Alumina Race Extensions are the perfect addition to your Zipp aero bar. They help keep the rider in the most aerodynamic position possible without sacrificing comfort. With the goal of feeling like the rider is shaking hands with the bar the 52mm rise helps keep the riders wrists at a natural bend to help them stay in a tuck position for long periods. This aluminum version has a very reasonable price tag and comes does not add too much weight compared to the carbon version. The Vuka Race Bend keeps the hands in the proper position to avoid pain or fatigue to the wrists. With a perfect fit for riders using under base bar extension mounting, the Zipp Vuka Alumina Race Extensions help you reach professional-level aero performance.