Originally Posted by
PeteHski
A complete flat disc is as aero as you can get. Like on a TT wheel for example. But obviously not good in a crosswind. The Tesla wheel cap is a compromise between styling, aero and brake cooling. Only the aero part is really relevant to a bicycle wheel, but a flat disc is even more aero. Maybe a "Tesla" style disc might be fractionally better in crosswinds. Traditional alloy car wheels are not very aero at all, which is what Tesla have addressed with their trim design. It's quite effective.