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FWIW -- there's a small 'problem' with relying upon tire DIAMETER, in the real world, because of vehicle weight loading, it LIES to you:
1) With NO load, tire diameter is accurate...
...but...
2) With VEHICLE load, "true" rolling diameter is ALWAYS SMALLER than the unloaded diameter -- typically about 3% smaller, or 0.97:1 -- and this value VARIES from manufacturer to manufacturer, depending upon tire size, load capacity, sidewall height, etc..
Michelin tires are about 0.97:1.
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