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What is the maximum wheel size that can be installed on a 2008 C6? Stock is 18 - 8.5 / 19 - 10.
On wheel diameters we hae seen pics here of guys going right up to 22 inches - not my taste - but you can do it. Realistically 20 inches on the back and 19 inches on the front is how most upsize, although you can do 20 inches in the front as well.
Wheels on the back can go to 11 or maybe even 11.5 inches wide. I have run 10 inch wide on the front.
On tire sizes, a 325 width is probably the max, but it only works with certain wheel offsets. I run 275's on the front with no problems, chances are you could even go wider.
All of this is for the base coupe, not a Z06 or GS...