Hello All,
A good reading easy to Google and find on the Internet about wheels mentioned by Julian Edgar is from Alexey Vdovin, 2013, Investigation of Aerodynamic Resistance of
Rotating Wheels on Passenger Cars.
The author found out that a wheel with a "thick outer radius cover" was better than the complete cover. Also the Tesla model S aero wheels are of interest. These wheels are almost completely covered but for an open ventilation ring around at the outer wheel diameter.
I intend to test both approaches in the coming weeks and will let you guys know about the results.
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