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As that ratio increases (as you would get fitting a narrower, lower volume tire in an existing wheel housing), drag goes up too, about ten counts for every doubling of the ratio. And lift coefficient increases 5x as fast, 50 counts for every doubling. But, it's unclear what effect a smaller volume, narrow tire that still fills the area of the wheel opening would have...
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That's interesting. Citation? I'm thinking of those lowriders with their whitewalls on Astros.
Vs your stanced Beemer.
As for airflow exposure, spats are back.