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I just put thin spokes on my '92 and I need to move the rear wheels out, they are not rubbing anywhere but I just don't like that they do not sit out to the edge of the wheel well like I want. I am planning on getting either 3/4 or 1 inch wheel adapters when I get to Carlisle this week. I am also going to try a front wheel on the back to see how that looks and if it fits the wheel well better I might try to find 2 more front rims at Carlisle. Don't know if this helped you any but I just wanted to share what my plan is.
If they're 8.5 @ 58 for the fronts I'd buy 33mm for the front and if the rears are 9.5 @ 65 I'd do 27mm for the rears. That would place the wheel tire in nearly the exact same placement as the 9.5 @ 38 of the '85 Z51. That would be ideal I believe for appearance.
If you wanted to get close to those and the adapter/spacer is only offered in SAE dimensions buy 1 1/4" for the fronts and 1" for the rears. That's close enough. Be sure to buy adapter/spacers that are hub-centric to both the car and the C5 wheels. That's a 70.3mm wheel center bore.
Your C5 wheels should have the specifications cast into the rear of them - I'd check that and post back before buying anything to confirm.
If they're 8.5 @ 58 for the fronts I'd buy 33mm for the front and if the rears are 9.5 @ 65 I'd do 27mm for the rears. That would place the wheel tire in nearly the exact same placement as the 9.5 @ 38 of the '85 Z51. That would be ideal I believe for appearance.
If you wanted to get close to those and the adapter/spacer is only offered in SAE dimensions buy 1 1/4" for the fronts and 1" for the rears. That's close enough. Be sure to buy adapter/spacers that are hub-centric to both the car and the C5 wheels. That's a 70.3mm wheel center bore.
Your C5 wheels should have the specifications cast into the rear of them - I'd check that and post back before buying anything to confirm.