[David]

Originally Posted by greglepore

David-yes, in a group dynamic they matter. Particularly when others have them. Another benefit to deep rims is that they're stiffer, and stay true much longer. Just as a data point, the a33 and Boyd's alloy rims weigh about the same or less than an equivalent carbon rim, and test just as well in the tunnel as 303's and as good as 404's except at wide yaw. And they're 21mm internal. I like them as much as various 50mm carbon wheels, Lightweights excluded.

I can only find 17mm inner width on the Zipp website. Where have you seen 21mm?

I haven’t seen 21mm inner width on any rim brake wheels except the Bontrager wheels so I’d sure like to hear about any others.