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Old 12-09-2009, 06:06 AM   #11 (permalink)
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Originally Posted by Old Tele man View Post
...tire "hysteresis" is a function of rubber flexing upon contact with the road, then compressing under weight, then un-flexing upon release from the road.

...that's *why* an older, well worn tire has a lower rr value than does an identical brand new tire.
Hysteresis is the amount of heat generated for a unit volume of rubber doing a unit of flexing. Think of it as internal friction.

And since there is less rubber in a worn tire, that's why worn tires have lower RR than new tires - everything else being equal.

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