George,
If a 15x10 Campi has -6mm offset then Jim's backspacing measurement of 5.25" was 100% accurate.
Jim,
I believe most of the rubbing problem I had was due to the Hoosier tires I'm running. They are about an inch wider than a normal street tire and the tread is the widest part of the tire, which makes matters even worse. I'm about to switch back to a normal street tire while I can still get them. I might try un-doing some of the things I did to prevent rubbing, to see if it was all caused by the tires.
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