I spoke to someone from Tire Rack and they said that they cannot guarantee that they will mount the 225/50R18 tire on the 8.5" wheel (only if someone is a bit careless and doesn't happen to notice the larger wheel width). He also mentioned that the tire manufacturer would not guarantee proper performance of the tire since it would be used beyond its recommended mounting width. By the way I have settled on 225/50R18 Michelin X-Ice Xi3's with silver Sport Edition A7's. I live in Toronto, Ontario, Canada and my Z is daily driven so I am looking for all the snow & ice traction I can get.
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