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Hi,
In my scan/reading of the Hucho book, they mention that minimizing the air around the (rotating) tire/wheel does help lower drag. The tire itself is churning the air around it, so if the volume of air that the tire is moving is reduced, then that can have some effect.
The challenge is to deal with it as unsprung weight. The forces that will be banging it around will be fairly strong, and the added weight will affect the ride/handling somewhat.
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