I need some outside the box type thinking right now.

I want to put the same size tires all around on my Roadrunner. I've seen Todd (blackwidow69) manage to squeeze 275's in on the front of his 69 Roadrunner.



With 255's on 15x7 steelies (4 inch backspacing, right ?) I have rubbing at the rear of the front frame rail. In it's defense, that wheel is not the right size for even a 255 and the sidewall bulge is significant. With the right backspacing and right width wheel, I don't think I will have the same issue even with a 275 on a 9.5" wheel.

What backspacing would you use to get a 9.5" wheel onto the front of a 68 B-body ?