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      10-06-2009, 10:45 PM   #60
swamp2
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Drives: E92 M3
Join Date: Sep 2006
Location: San Diego, CA USA

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Another test I would love to do (as much as it would likely not even be rigorous and would only be a single data point) is to run back to back two sets of PS2, one say <10k mi, <6 months old, around 50% worn, vs. a new then immediately shaved set of PS2's, shaved just into the wear bar or say slightly above the wear bar. I think their is ample evidence and opinion here that they would be very close in traction or perhaps the latter having some advantage. I think the only way this could be the case is if those of us who have experienced significantly observable traction loss under a similar extreme wear scenario are also feeling significant negative/confounding heat/UV/aging effects.

As with many complex things I examine I simply like to see consistency among anecdote, testing, theory, common sense, etc. and this one is vexing...