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You could also use coroplast (political signs) as a wheel cover. I think I may try it on my rear wheel. But I imagine I won't notice much of a difference. It's something that will help, but on it's own, hard to tell.
The idea behind it is that the spokes at the top of the wheel as passing through air at twice the speed of the bike. Put the rear of the bike on a stand and feel the air movement next to the wheel at full speed. It's something. Maybe 50watts, maybe 200w.
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