tire size question

So my tires are starting to show their age, and it's time to replace them. I'm currently running the stock size of 205/75/r15 on the stock 1984 M-body wheel of (I think) 15x7. IMO, there is not enough tire under the car, and I think it almost has the "pizza-cutter" look, especially in the back. Again, just my opinion. I'm going with the traditional BFG radial T/A with the white letters. I've been doing some research on different tire sizes and seeing what will work. This is what I found:...

tire size question
Author: rcmaniac791