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Taking the elegant motion of the whale and the shark as they cut through the ocean as their starting point, Zipp has created a wheel that offers a similarly streamlined experience as you speed along smooth, unobstructed routes. Looking specifically at the leading edge of the whale's pectoral fin and the microtexture surface of the shark's skin they have developed an undulating 53/58mm-deep rim, which has been put through its paces in Zipp's lab to achieve the desired fast and efficient rolling they were looking for.
The results of their endeavours have led to an air-drag reducing wheel which minimises side force at every wind yaw angle. The carbon construction maintains a stiff and responsive build, while the SawTooth profile and ABLC dimpling add to the speed and efficiency of this well-crafted wheel.
The name given to the Zipp NSW variable depth 77/82mm rim profile. This design is the result of rigorous wind tunnel and real-world testing. The rim shape takes natures elegant design solutions and combines their precise engineering finesse to deliver a wheel that performs like nothing else before.
This technological design refers to the individual nodes that are part of the Sawtooth rim design. Each of these structures feature the Hexfin ABLC dimples that stabilise handling in gusting and strong wind conditions by increasing wind vortex shedding. The dimples create a secondary vortex around the outer rim surface, which in turn heightens the wheel control and saves rider energy from being wasted.
Hexfin Aerodynamic Boundary Layer Control (ABLC)
The Sawtooth dimple design consists of 12 nodes that are specifically clocked to start aerodynamic shearing at a rate of 50hz at a rider speed of 20mph. Sawtooth accomplishes this by inducing small sheet vortices that shed at a low magnitude, but at a higher natural frequency, thus decreasing the laminar bubble effect on the aerodynamically shielded side of the rim's profile to further reduce high yaw drag and improve crosswind stability.
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