Posted by Jeff Roberts on 10/21/2016
The wheels on this car are 18x7 and the backspace is 4.25" (+6mm offset). As can be seen in this picture, 8" wide wheels would be hard to fit on this car without rubbing the fender. If you had custom built wheels made with more backspace (ex. 5.25" backspace) the 8" wide wheel wouldn't stick out any further than these 18x7 rims pictured here, however, they would go inward too far and cause fitment issues on the inside. Here's a look at this car from the side view.
One way that many customer's solve this problem so they can put staggered wheels on is to put a fender flare kit on their C2 Vettes. This allows them to run a wider wheel and tire in the rear, and some customers even do so on the front as well. Here is a picture of a C2 that has fender flares.
Ae you can see from this picture the flares allow for the wider wheel to stick out farther on the C2. So if you are looking at putting a wider wheel and tire on a C2 Corvette, then you are also looking at some extensive body modifications.
Below are some popular wheel fitments for the C2 Corvette that do not require any body modifications: