Just another data point for everyone who's interested.
13x9" Diamond Racing wheels with 5.5" backspacing
Everything fits perfect and there is no rubbing whatsoever. The tires look perfect on a nine inch wheel, as you can see from the pictures in John's post above. I would assume that you could stretch them over an 8" wheel without too much trouble, but 9" looks really good.
I'm excited about next weekend.
Jake
Finger Lakes Region, NY
'91 Sentra SE-R --- Rally Beater
'92 Miata --- CSP