Help with Wheel and tire combo please!
If you don't want to modify the car any, the widest you can safely go in the back and keep the tires inside the quarters is a 275. In the front you can also run a 275 without modifications to the body, but depending on the rim and backspacing you might need to change the UCA's out for tubulars, I needed to in order to clear the rims at full lock and droop. You also won't be able to run 275's on anything less than a 17" rim though, as you can't run enough backspace with rims smaller than that (and even some 17's).
There really aren't any tires available for the 15's in decent sizes anymore unless you want to run BFG T/A hockey pucks, Coopers, etc. Nothing designed in the last 20-30 years. That might not be a problem for you, it really depends on what you're plans are for the car. But if you want a tire with a half decent compound and handling capabilities you won't find anything street legal for a 15" rim.
I run my car with 275/35/18's up front on 18x9's and 295/35/18's out back on 18x10's. But I've offset the rear springs a 1/2" and cut another 1/2" off of the inner quarter lip to make those work in the back. My backspacing numbers are a little different from stock though, as I have a B-body rear end and 13" Dr diff front disks, which have a wider track as well.
If you don't want to modify the car any, the widest you can safely go in the back and keep the tires inside the quarters is a 275. In the front you can also run a 275 without modifications to the body, but depending on the rim and backspacing you might need to change the UCA's out for tubulars, I needed to in order to clear the rims at full lock and droop. You also won't be able to run 275's on anything less than a 17" rim though, as you can't run enough backspace with rims smaller than that (and even some 17's).
There really aren't any tires available for the 15's in decent sizes anymore unless you want to run BFG T/A hockey pucks, Coopers, etc. Nothing designed in the last 20-30 years. That might not be a problem for you, it really depends on what you're plans are for the car. But if you want a tire with a half decent compound and handling capabilities you won't find anything street legal for a 15" rim.
I run my car with 275/35/18's up front on 18x9's and 295/35/18's out back on 18x10's. But I've offset the rear springs a 1/2" and cut another 1/2" off of the inner quarter lip to make those work in the back. My backspacing numbers are a little different from stock though, as I have a B-body rear end and 13" Dr diff front disks, which have a wider track as well.
