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...from the number crunching I did, that "flat" spot (contact patch) area on the bottom of the tire roughly equates to a 3% reduction in the mathematical radius of the tire.
...I got ~97% values for the 16" diameter Goodyear, Firestone/Bridgestone and Michelin tires that I analyzed.
...how'd I do it? Just backsolved from their posted tire-revolutions-per-mile against their published static (unloaded) tire diameters.
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