Don’t worry—you can find your Chevrolet Camaro’s rim size listed within your tire size!
Once you find that, look at the two numbers right after the R. This is your rim diameter in inches.
For example, on a 2018 Chevrolet Camaro LT, one possible tire size is 245/50R18SL. For your purposes, you’d want to pay attention to the numbers directly following the R—that’s the diameter of your rims in inches. So, in this case, you’d have 18-inch rims, and likewise, you’d need 18-inch hubcaps.