Today i went to my local discount tire to have look at my Pirelli P7000 supersports that are cupped after only 5000 miles. The guy told me that all m3's have cupped front tires because you can't rotate the tires because the wheels are differnt sizes. I don't buy this because i have read on the board that the Pirelli's have a cupping problem. When i mentioned this he said any tire would cup. Is this true? Are everyone's tires cupping.