[TPete19]

Use this tool to help judge the fitment of aftermarket wheels.

1010TIRES.COM - Wheel Offset Calculator

Stock CT wheels are 17x7 +45.

An 8.5" width with a +45 offset will push the faces out 19mm and give 19mm less inner clearance.

 

[TPete19]

If I were getting aftermarket wheels, I'd try to stick with 7"-7.5" wide.