I would like to know if 18x9.5 with 275/35 R18 will fit on the rear of a 2002 camaro

 

The wheels will fit, provided they have a 5x4.75" (120.65mm) bolt circle, and the offset of the wheels is in the range of 35-60mm. But most tire manufacturers recommend at least a 9.0" wide wheel for a 275/35-18 tire. You would be better off going to a 18x9.5" wheel. Or if you want to stick with the 8.5" wide wheel, use a 255/40-18 tire.

I'll move this to our "Wheels and Tires" forum for you.