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I don't like the idea of the sidewall rubbing on stuff
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I hear that when the subject comes up. 1/4" gap couldn't hurt.
IMHO it wouldn't rub; more of a press and release. Notably at the bottom where the tread will flex. If the rim is wider than the tread it braces the sidewall to increase what's called 'turn-in' and reduce sidewall flexing. A soft wide tire on a narrow rim can be rolled right off in hard cornering. The hubcaps tend to go first.
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Not an easy thing to tuft-test... though I am working on a smoke generator / smoke wand, which could be useful.
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Put 'smoke' in the search field. Personally, I like to drive on the freeway in a heavy rain and observe the forward-rolling outward-expanding spray; and how it varies from vehicle to vehicle.Since the water particles have more mass than air, you can read them like vectors in a CFD diagram.