Video of the new, 2011 Zipp Carbon Clinchers.
We’ll have these on test soon. Summary: Zipp waited until they could make a carbon clincher their pros would ride, according to the rep.
Note that Zipp shares the toroidal shape patent with Hed and the wide C2 rim that Hed introduced. Bontrager also uses the toroid and wide rim, as the wings for their wheels are made for them by Hed.