You can look up any number of manufacturers rev/mile for a given size. You will find they tend to group together in a range and then you will see that the Miata Tire Toy program calculates a value for that size that falls outside of that group. You could say that none of the tire companies can count or measure but I would say the Miata Tire Toy program makes erroneous assumptions and then gives false results. Also, axle center to ground distance is a poor way to measure tires for revs/mile purposes as inflation pressure affects that static measurement to an extent that greatly exceeds its effect on true revs/mile while rotating.
Mark
John Bange wrote: > > I would love to trust the manufacturer's quoted numbers, but when the Revs > per Mils and the diameter they state don't match, it's hard to take them > completely seriously. I suspect they might use the largest possible > diameter, and the smallest possible rolling radius. Given that, I tend to > use the mathematical number initially, and then actual physical measurement > after they're on the vehicle (axle center to ground, and GPS mileage vs > miles clocked that assume 805 RPM). > > -- > John Bange > |
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