The ZIPP Difference ZIPP bicycle frames reduce drag. This is because there is no seat tube, seat stays, or rear brake. Air flows between your legs and reattaches more easily behind you. In fact, wind tunnel tests show that at 30 miles per hour, a rider in an aerodynamic position riding a ZIPP bicycle will expend 18 percent less effort than on a traditional diamond frame. The Wheel Facts Wheels are secondary only to frame design in factors that effect drag.
Most experts agree that a flat, solid disc wheel is the most aerodynamic.
Similarly, deep rim wheels are aerodynamic not only because of their shape, but due to the shorter spoke length. The outer perimeter of the rim is the fastest moving part of the wheel, therefore by shortening spoke length we decreased turbulence resulting in less drag. Also by using a stiff material like carbon fiber, the number of spokes on a deep rim wheel can be reduced.