[Pete_vB]

I'm also interested to hear how the new SS will compare to the PS2 on the 1M.

I recently made a similar swap on my daily driver, going from the PS2 to the SS. It was a huge leap in performance- the PS2 wasn't may favorite summer tire, though it did have impressive turn-in and decent dry grip. The PSS is on a whole different level; turn in isn't as good, but everything else about the tire is much better.

That said, I wasn't running BMW M3 spec PS2s, and those are significantly better than standard PS2s. For example a friend who works for one of the big 3 tested the 285 PS2s from the M5 vs the 265 PS2s from the M3 and found the M3 tires gripped better despite the smaller size. Thus I would expect the change from PS2s to SSs to be smaller on the 1M, though still noticeable. The only risk is that either the 245 was designed for rear fitment or the 265 was designed for front. If that is the case then it's possible the SS won't be a good choice- not sure the tire rack guys would know this, but someone at Michelin would.

I'm hoping they will eventually make a BMW spec SS for the E90 M3/ 1M- the best of all worlds.