I have a 69 Camaro with American Racing Torq-Thrust II 15 x 8 inch wheels with a 3.75 backspace.

Wheel size is 255/60R 15 and they are rubbing the rear finder.

With the current wheels, I have about 2 inches of clearence for backspace, but how do you figure what the correct backspace to get is?

I am getting tired of putting aroud town. I need to get some new wheels so I can burn the rubber off the tread instead of off the sidewalls.

Thanks for your help.

FYI:
I am not this wide on the front and have no probems.