Quote:
Originally Posted by Donahue
I'm curious of the physics involved in this. On the surface, you would think tire resistance would be linear. What is causing the curve, is some sort of internal dynamics on the tire causing the change? Is is something like heat, or a harmonic vibration or something? Do speed ratings have any effect on when that curve occurs?
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Best guess = standing wave that grows as the speed increases.
I'm not sure what effect speed ratings have - or more precisely, what affect the change in construction has - but I suspect that the increased RR you get to achieve a higher speed rating is only slightly offset by the softening of the speed effect.
Put another way:
1) Higher speed rating = higher RR (all other things being equal)
2) Higher speed rating reduces the effect speed has on RR, but does not eliminate the effect.