What are the widest tires I can safely put on the rear of the '06 Coupe with 19's. I have the sport tuned suspension and my fenders are not rolled. Thinking about 255/40 19's, but will 265's fit without a problem?

Dropping about $7K into the ride this week and need to make a final decision.

 

275/35 is good for the rear. There is a tire thread OEM 19's.