Look what I just got in the post

Really? I would have thought that the profile including tire would need to be symetrical since the leading edge becomes the trailing edge and vice versa.
So is a pointed leading edge better than a rounded trailing edge?
Was'nt a serious comment TBH. My CXP 33's hve a sharpe profile at the spoke holes, and thus 'look' very fast. My carbon rims have a 5mm wide flat face at the spoke drillings.

The important part of a rims aero dynamics, is related to how it affects air flowing onto the spokes. So while something like a tear drop, with the tyre acting as the round edge, and the inner face of the rim, acting as the 'pointy' bit, seems to make sence. Quite how this affects the air flow that the spokes experiance, is a bit beyond me TBH.