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Alright looks like i'll be going with these but on a Etron GT. Having winter tires in California doesn't make sense but I often enough to Tahoe where I need some kind of snow/ice performance.

Thanks for the info. As for your process did you for checking the diameter. You just checked the diameter of the tires? Because the Contacts are 28.3 tire diameter, and then the michelins in 315 are 28.5. I plugged 305/30r21 into a size calculator and looks like 315/30r21 are within a margin...

How did you figure out the 315/30-2 fit? Did you just order them? The reason why im asking is it looks like tirerack is the only company that current has them so I don't want to order them and find out they don't fit my wheels.