What offset are you running? I don't think mine rub on an 18x10 with a 40mm offset.
I know it's possible, as Blown38 is running a 315 on the back on a 17" or 18" wheel.
Right....well, I only have rub issues when the suspension compresses, it rubs just above the rear shock mount...and the only reason THAT happens, is becuase the car is so low...suspension travel would never reach that point with stock springs...With my setup 275's rub, 285's, which I currently have, rub worse...the rub occurs on the inside side wall against the area above the rear shock mount.
So basically, it's either some high quality custom made hubcentric spacers...or stock springs, and at this point, I am OK with either one...but stock springs, would open a larger can of worms than I could handle financially, since they would lead to new koni adjustables all the way around, and a full front end rebuild...which I would love, but don't have the money for...I will be buying a set of stock springs for it to have on hand though, very, very soon, since that is the ultimate plan for the car....I like it low, but it's not practical for me, as a daily driver...now if I get something else as a daily, and retire this car to weekend/track/fun duty, then it can stay slammed for all I care...it's all up in the air right now.