I had Bridgestone RE and now have Dunlop Direzzas on my S2000. Extreme performance summer tires like these are a waste on an X1 IMO. They only last around 10k miles.
That is why I am such a big fan of of te Michelin PSS. You get a great amount of grip for a tire that can last 25-30k miles. I wish I could have moved them from my 335i to my X1.
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