15x8 wheel with 4.25 bs "biggest tire option without rub"

I was wondering the same thing. With the 4.25 back space, how close to the spring is the tire?
Can I get another 1/4 inch? What about 5?
In some worlds, a 1/4 more is to much.
:rofl:
My 67 Barracuda with a 8 1/4 axle had a 15 by 8 rim with a 4.25 backspace and a 245/60/15 tire and I had less than 3/8's inch between the sidewall and the spring.