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I just purchased a 2017 Grand Sport. I will be driving it from Indy to Florida this winter. I purchased a set of Centennial Cup rims so I can put a set of all season or winter tires on it for the drive and use in Florida. I see that Michelin now makes an all season run flat Pilot Sport A/S 3+ in a 285/30ZR/19 size that will fit the front. They do not make a corresponding 335/25ZR/20 for the rear. However Pirelli makes a non-run flat Sotto Zero 3 that will fit the rear.
Now the crazy question: Would it be ok to use the Michelin fronts and the Pirelli rears?
You'd be pairing two different tread patterns and on top of that two different tire types - all seasons on the front and winters on the back. I wouldn't do that if I were you, but I don't have first hand experience with what will or won't go wrong if you did it.
Pirelli threw a fit (and Luke from tirerack advised against it too) when I asked about putting Sottozero 2s on the front and Sottozero 3s on the back.
What I eventually went with were a complete set of winters. Sottozero 3 -275s in the front and 305s in the rear. Verified to work on the stock wheel size by a couple Z06 owners who winter drive it and Luke suggested the same combination.
The post that I linked to above (#73, Page 4 on that thread) shows how the thinner tires look on the Speedline Cup wheels (which turned out to be the GS wheel design anyway :P ). Slightly anemic if you look close enough since the wheel lip sticks out a tiny bit more - but not that much.
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Crazy Winter tire question
