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I have been running the OEM sized 4S for a little over 20,000 miles (had the terrible Conti's for the first 10,000). After a fair amount of thought and an ambien I ordered the 255 front 275 rears in the 4S to replace my current 4S. After taking the 4s off and putting my track wheels and tires on I see they actually have more tread depth than I had thought even after 21,000 miles and 2 track days so the 255/275s will sit in the garage for a while but I will be able to give a apples to apples comparison once I have experienced the 4s in both sizes. My rational for upsizing is this is the tire size on the M4/M3 and others have reported good things or at least no negative consequences of going with these slightly wider tires. 10mm is less than 1/2 an inch of tread width so I am not expecting a big change. I won't be tracking these tires because I now have a set of Cup2s and OZ Racing wheels for the track so I won't be able to give a track comparison.
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