i am going to a swap meet this weekend where they usually have some good deals on tires. i have a 95 formula with the stock 10 bolt rear. i was thinking about picking up some mickey thompson 325/50r15 et street radials. i dont have any wheels yet. i was wondering what offset and bolt pattern wheels i need. i know i will have to grind the calipers. i was thinking i would pick up some 15x10 welds or something similar. the offset of the wheels was my main concern.

 

You will need a 7.5" backspace with a 15x10" rim. But I hate to give you the bad news it is not easy to go to a 325/50. Some people just beat the hell out of the inner wheelwell but the tires will more then likely rub. Most people with a 325 installed mini tubs.

 

I'm running a 28x10.5-15W ET Drag, and according to the M/T dimensions, it has the same section width (13.1") and almost the same diameter (28.1 vs. 28.0) as the 325/50-15 ET Street Radial. Mounted on 15x10 7.5" BS Pro-Stars. It fits, and doesn't rub, but the wheel wells have already been hammered for 315 street tires and ZR1's. There are photos of the hammering in the Wheel and Tire FAQ - General. I do have problems with growth at the top end, but the radials will not grow like the bias-ply ET Drags.

 

PS: All 3rd and 4th Gens use a 5 x 4.75" bolt pattern.