Originally Posted by
shogun17
... but wouldn't there be a certain velocity where that changes when the airflow attaches to the wheel instead of flowing in an non-aerodynamic manner?
Look at the Reynolds number for typical riding speeds and the range of Re over which separation occurs. Even taking the range as 5-30 mph (when 15-30 is probably better for TT's), that's only a factor of 6. Changes in the general characteristics of a flow take place over an order of magnitude or more in Re.
Oh, and here's the best Zipp data I've seen
http://forum.slowtwitch.com/gforum.c...engine#1460321