Originally Posted by San Rensho
Unless there is a carbon fiber rim out there that weighs less than the Ambrosio Crono F20 (340 g), there is no way that a CF wheel is going to be faster than an aluminum one. I looked and I couldn't find find one, the closest was Reynolds Cirro at 412 g.
Actually the aerodynamics of a wheel are more important than weight (
http://www.biketechreview.com/archive/wheel_theory.htm ). Hence a deep V wheel like a Stratus will be more efficient than a lighter standard depth wheel.