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I did a quick google search, I tried "Wheel Offset Calculator", "Corvette Central", and "adapters for different rim sizes". There appears to be a lot of info but a bit of research should let you sort it. Otherwise I'd say talk to a reputable tire shop. You need to get rim and tire combinations that won't mess with your speedometer. I doubt, (but I'm not certain) that GM would have used different bolt patterns when they went to larger wheels on the later C4's. iTs liable to be a bit costly, but a Corvette grin isn't cheap (LOL). Good Luckhi tires for a 85 are hard to find. anyone put on different rims to get to a 17 or 18. suggestions? i see i may need adaptors is this good or bad?