Consider the Pirrelli Zero Scorpion Asimmetrico's which are available for the sport 19" rims. They are mud and snow rated. I have driven them through snow storms and was pleased with their performance. On dry pavement thay are as good as the Michelin's. Regarding tire life, I am on my third set, I get 25K miles per set and replace before I hit the wear bar.

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2001 X5 4.4 100% options
2004 M3 cabriolet SMG