I can't tell you much this advice helped my boy and I Saturday! Went out 2nd practice and he was FAST but needed to find another tenth or two. Great feedback from my driver, "I could use a little more grip on entry and through the center." We were on a set of tires rerolled 6 weeks ago and I went to a set rerolled 4 weeks ago and he went and qualified and finished 2nd in a packed class. I might have gone for a set of FRESHIES / once rolled 8 week tires if I hadn't read this reply the morning before the race.