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[DrRobert]

Originally Posted by Fundguy1

I went to 18 non run flats then to 19s. I was using michelin pilot sport 2 at the time. PSS weren't out yet. It firmed up in cornering with less sidewall flex and ride was firm but not harsh at all. Not many potholes here though. Handling and grip also went up. 18s with run flat were much harsher, louder, and are heavier than non run flat 19s so that was dramatic. Faster, more compliant quieter ride without runflats

Thanks, that helps to know. I took the runflats off the very next day after I got the car last year. PSS were fine for a while but not any more after engine mods/tune, at least not in this size.

[Fundguy1]

I know the feeling. I'm attempting 305 rear if I can squeeze them in.

[DrRobert]

I'm doing 275s in the rear, and either 245s or 255s up front. Would prefer 255s to be closer to square, but the overall diameter of the 245s is a better match to the 275s. Currently my 225/255 PSSs are 25.1" front/25" rear OD. The 275 RE-11s are 25.6" OD. The 255s are 25" and the 245s are 25.7". At the moment I'm leaning toward the 245s to keep the ride height balanced front and rear. What do you guys think?

[Fundguy1]

245 front 275 rear is what m3 uses. I'd go that way. I'm going hopefully to 255 because they'll match the wider 295 or 305 rears. My 235 275 combo works well. Even 4 wheel slides and no over or understeer problems. I think 255 will be overkill with 275 rear.

[DrRobert]

Originally Posted by Fundguy1

245 front 275 rear is what m3 uses. I'd go that way. I'm going hopefully to 255 because they'll match the wider 295 or 305 rears. My 235 275 combo works well. Even 4 wheel slides and no over or understeer problems. I think 255 will be overkill with 275 rear.

It might come down to what sizes are offered by Bridgestone. Thanks for the help!