I really think it's more tire dependent than TW. I'm on RT615K+ right now and selected them after doing a lot of reading on the chumpcar and lemons forums and seeing people getting good wear out of them without cycling out too easily. The older non-plus version seemed to have a bad wrap though because they would overheat real easy. In the past I ran a bunch of sets of the various generations of the Dunlop Z1, Z1 SS, ZII, ect ect and also liked them because they seemed to grip until the day they were on cords. I don't track my cars very often but go through phases where I autox regularly but if I was seriously committed to autox or track days I would for sure just get a dedicated set of tires for the track.
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