ZIPP's Project Firecrest 808 Carbon Clincher
Zipp Speed Weaponry's most popular wheelsets have undergone major transformations, with a radical new aerodynamic rim shape named 'Project Firecrest' now applied to the 404 Tubular, 404 Carbon Clincher, 808 Tubular, and the new 808 Carbon Clincher.
Whereas Zipp's earlier designs placed a toroidal bulge behind the tire to reduce turbulence at the wheel's leading edge, Firecrest shifts the widest point of the rim inward towards the hub and tapers only slightly towards the tire. At a 10-degree wind angle, the performance improvements from Firecrest are substantial: 9 seconds over 40km for the 404 Tubular, and 15 seconds for the 808 Tubular that is now faster than any 90mm rim and even some disc wheels.
At higher wind angles, the benefits are even more dramatic. In crosswinds, Firecrest rims provide markedly more stable handling than other rims of equal or even shallower depth. The wide rim profile also increases stiffness for sprinting and cornering while adding comfort and durability on rough surfaces.
Despite their upgraded aerodynamics, weights for Firecrest-based wheels remain among the lightest in class: 1759g for the 808 Carbon Clincher.