tire and wheel guys in here !!!
update: someone told me a speedo recal is unavoidable. I was looking at an auction on ebay for 17x9.5 (54mm) and 18x10.5 (58mm) backs....will those fit on my car without any fitmen problems?
17" x 9.5" use a 275/40ZR17 tire, same as OEM Camaro SS tire size so speedo is fine.
18" x 9.5" (yes they are available) use a 275/35ZR18 tire, again same overall diameter as stock, so no speedo issues.
18" x 10.5" I recommend a 295/35ZR18 tire, now this tire is a little taller than stock so speedo calibration is required.
So, if you don't want to mess with the speedo avoid the 10.5" wheel. Either choose (4) 17" x 9.5" or (4) 18" x 9.5" or a combination of both.
Hope that helps. I an running chrome Z06's on my SS, see sig.

