Backspacing

Jack it up and put jack stands under the diff and lower control arms so it is basically sitting at ride height Using a straight edge, measure to the fender lip and to the inside of the fender well. This will give you an idea of how wide of a tire you can run and the backspace you'll need. There is actually a tool for this I saw on HorsepowerTV but I can't find the link for it. These links might explain it better.

Wow. Bookmarked both those links...

I guess those cars with the wheels sticking way out of the wells would be a prime example of negative offset, something I do NOT want. I think I seen the same episode of the HPTV you mentioned, were they working on a Chevelle/Camaro? If that is the one, they ended up with an 12" wide 17"tall tire up under there without rolling the lip... Now that is something I am looking forward to doing...

Right now as I speak, the car has 265/65/15 on it, with airshocks keeping the tires from being cut to shreds. Said tires come out of the wheelwell 2" +/- It was a cool look last century, but now...

This must change.

Wm