Vette(s): 1968 Black Prime Coupe, 427 custom built, 4 speed (M20), 3:36 rear end, Recaro seats, Intro wheels, Nitto tires, and Flowmasters. Restoration awaiting painting.
I have Intro Pentia billet wheels in my '68. The tires are Nitto NT 555. Upfront I have 245x40x18 (Wheels are 18x8). In the rear I have 275x40x18 (Wheels are 18x9). I have had this settup for over 7 years now and never had any clearance issues. Since the wheels are billet wheels, they are the equivalent of 18x9 in front and 18x10 in the rear. As far as the backspacing, I believe it is 4.5". The wheels were manufactured to fit my car. I hope this helps.
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Corvette (Vette) Model Years on this site: 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982