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Guru, thought we may have passedd through this topic, maybe not, ....but I have 17x9.5 '92 vette rims on my '72 here, and I can say you will be able to run 255/50/17 in front BUT you have to limit your radius, or learn to relax the wheel in tight turns....as the sway bar and/or frame hits the tires....
now having said that, largest I ever heard of in front is 235 in a stock configuration....
meanint with a 15 inch wheel, and 60 series tire, that's pushing it....
my steering was limited by extending the lower rub/snub block on the rear of the A arms...simple by adding a bolt with some washers/nuts on it for about 3/4 inch buildout...
Years ago when I ran the only thing available, a 275/40/17 tire in front, from a C4 vette, the tires just barely fit, with the limited steering, barely....
I had 255/50/R15 on the stock front wheels without any problems. You can go much larger with the correct offset and fender flares.
Actually I have 255 60 15s They rub slightly (on a non-sharp part of the frame, and only at the rear) at full lock. Just have to remember it in parking lots.
From: All humans are vermin in the eyes of Guru VA
Cruise-In IV Veteran
Cruise-In V Veteran
I bought the car with 275 60 -15d on it and they rub lightly on the front thats why I went with the 255s.
I am thinking about some 275/40-18s. they are 26.8" in diameter. on the 9.5" rim if I stay with the same 4 inch backspacing I am just curious if they will rub too.