I run the M/T 31.25*12.2 radial slick on my Challenger. I have maybe 65 runs on them so far. Last weekend they went 1.342 in the 60'. They are the most consistant tire I have ever run, but when they start to spin look out. I try to turn them every other weekend, so maybe every 20 passes or so. They are quicker by about .10 for me.