This should be adequate for brake cooling:
Quote:
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Originally Posted by mooneyesusa
MOON WHEEL DISCS can be made up to 46" in diameter. Don't see your size listed? Contact us for custom applications.
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http://www.mooneyesusa.com/MOON-Disc-Screw-on-p/md11-sc.htm
Their order form pop-up lists 10-18".
That example shown with the open center probably clamps to the rim. I'll see if I can find the reference.
Edit: I came up dry on Ecomodder, but there's the very thing:
http://www.ryderfleetproducts.com/deflecktors-22582512410s/fuel-saving-wheel-cover-for-steel-wheels-22.5-p-dfl-22582512410s
It turn out they're made from (possibly vinyl-coated) fabric.
If your taking the Donner pass, it would be easy enough to remove them at the summit. Next time you're there, check out the restroom at the 'Safety Stop', it's the most awesome one I've ever seen.
