Quote:
Originally Posted by white2001s10
.........I'm just not clear about how they achieve the lower rolling resistance...........
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Basically RR is caused by the amount of deflection, the amount of rubber being deflected, and the internal friction of the rubber (hysteresis).
So when a tire manufacturer wants to reduce the RR, he will take rubber out of the tire and / or change the rubber to one with a lower hysteresis. Both of these things negatively affect treadwear and traction (especially wet traction)