With a body similar to the new C7s, the 18" wheels on the ATS V were a little surprising to me as they seemed slightly small for the car. The tire diameters from front to rear are 0.7" different anyway and the rear fenders (especially on the coupes) make the back wheel "look" smaller than the front wheel to me. I'm an aftermarket wheel guy anyway, so I spec'ed out a set of 19/20" wheels.
These are the TSW Bathursts that I had the face machined, then brushed, and finally re-powdercoated in a transparent brass. They measure 19x9 and 20x10" with Nitto Invo in a 255/295 setup. She needs to come down some on the tires with some springs but it was a huge improvement for my visual tastes!
Before:

After:








These are the TSW Bathursts that I had the face machined, then brushed, and finally re-powdercoated in a transparent brass. They measure 19x9 and 20x10" with Nitto Invo in a 255/295 setup. She needs to come down some on the tires with some springs but it was a huge improvement for my visual tastes!

Before:

After:








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