[Asanti]

I talked directly with GM and they suggest that we stay with the asymmetrical tires, 285 front and 305 rear. However they acknowledge that there really aren't any manufacturers today that are making an all-season tire with those specs. GM told me that the ZL1 spec sheet also approves the use of a 275/40/20 tire. Yesterday I ordered a set of four Continental Extreme Contact DWS in 275/40/20 and new wheels from Tire Rack. This afternoon they were sitting on my front porch. I will get them installed by the dealer next week. Can't wait!