The Zipp Vuka Below Clip Alumina Extensions are the perfect addition to your Zipp aero bar. They help keep the rider in the most aerodynamic position possible without sacrificing comfort. The 70mm rise version of these extensions keeps the riders hands a bit lower for a tighter tuck. With the goal of feeling like the rider is shaking hands with the bar, these 70mm rise extensions can be precisely adjusted to the riders body and preference. A 20mm inward roll of the bar can be adjusted as can the width of the pads. A pad-angle wedge insert offers upward pad angles of -5 and -10 degrees or -15 degrees if stacked. With a perfect fit for riders using under base bar extension mounting, the Zipp Vuka Below Clip is one of the top choices for professional riders. The aluminum extensions will keep you comfortably in your fastest position to achieve optimal aerodynamics on the road.