Calculations are not presice. There are too many variables. It always comes down to loaded radius. That is the distance between the axle centerline and the pavement. That radius depends on such variables as ambient temperature, tire temperature, tire pressure, speed, load over driving axle, and probably a few other unknown factors like slippage. Ask any NASCAR tire tech but be sure to bring some Excedrine.
Speed is interesting because tires will grow due to centrifical forces. Ask any drag racer.
The best answer to your question is found by putting a revolution counter on the tire or axle and running the vehicle at a constant speed over a measured course (many miles). It would be nice if you could automatically start/stop the counter at speed while going through the traps.
But if you only need an approximate measurement, start with the published loaded radius values offered by the tire mfgs. Calculate the percent difference between sizes.
This post was edited by Wardner at 10:12:46 03/30/10.
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