Quote:
Originally Posted by Piwoslaw
........I've noticed that most articles on low rr tires (including this one) comment that lower rr reduces grip and braking efficiency, but only once have I read that those are two different animals: Rolling resistance is mostly from the tire wall flexing, while grip depends mostly on the type of rubber used in the tread. Of course, tread pattern has an effect on both, and decreasing sidewall stiffness can improve grip while increasing rr. If a tire is reengineered to have a stiffer sidewall, good tread pattern and soft rubber tread (all in the right proportions), then it will have lower rr while retaining safety and handling parameters.
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Sorry, but sidewall stiffness hardly enters the equation when it comes to RR.
RR is pretty much all about the tread compound - how much, what kind, how much deflection (basically inflation pressure). You just can't escape the Wear / Traction / RR triangle.
Barry's Tire Tech