But...but.....awwww.....

I am not a tire Guru
 

but the Goodyears fit perfectly on the rims. I know that when Rupp changed brand of tires on Penny a 255 in one tire was the same width as another brands 275. That was on an 18 rim and the aspect ratio remained the same.

You may want to compare tread and bulge widths between the brand of tires you want and the Goodyears that come stock on a Vette. They may be the same size.

I am diggin' your rims.

Have you test fit just the rims on the car without tires to check for clearance?

Haven't checked yet, no. I actually haven't gotten them, but I do know they fit. The gent I bought them from had them fitted.

I was thinking of going with BFG KDW2's, I had these on my MINI and loved them. But I want to try the Vredestein Sessanta's. The Z06 guys seem to love them.