What's the widest wheel and offset that will fit on 68 cuda

72bluNblu said
Think you've got that backward. LBP 8.25 is ~56.75" drum to drum, even the SBP 8 3/4 is 57.125".

Still makes sense though, you'd need the 4.5" (or more) backspace on the 15x8 with the 8 3/4 to put the tire in the same place as the 8.25 with a 15x8 and 4.25" backspace.
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My bad. I thought the LBP 8 1/4 was wider.

I ran 245/60/15 on a 15x7 4.25 backspace and thought it was sorta tight on the inside. But the 8" rim must pull the 275 to the outside enough for inside clearance.