The suspension sits approx 10mm lower on the right side so when you take a fast left, the suspension puts the tyre already 10mm closer to the fender. The other possibility is that those of you who have used a 245/35-18 PSS before have probably by chance gotten the BMW star designated version which is slightly different to the non-star version. Likewise with the 255/35-18 PS2, it may have been a star or other make-designated version.
Then again, having slight variances in actual tyre dimensions for the same marked size is not rare
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