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My PSS's chunked like the OP's during track use prior to having my M3 control arms and camber plates installed. Now with these mods I am able to get -2.0 degrees camber, which is not great but sufficient to eliminate chunking of the front shoulders. I still get some shoulder wear on the left side but since the PSSs are assymetrical, I just swap left to right halfway through the season.
Since I don't have the option of running a set a dedicated track wheels, I need to find the best tire compromise for combined street/occasional track use that will last me the whole season.
On that note, the PSS - although far from being an ideal track tire - is hard to beat. It has good tread life, excellent wet traction, and great grip both on and off the track.
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