I'm curious to know if anyone else has had this problem. I just picked up my new '02 S80 2.9 a few weeks ago, and already it's been in the shop twice for a vibration problem coming up through the steering wheel and the seats. At the first visit, the dealer rebalanced the wheels, but this didn't solve the problem. Now, I'm being told that my rear tires are "out of round". My car has Michelin 225/50 MXM4's. I've never heard of such a thing. Can someone explain to me what this means? Is it common? New tires are going on today, under warranty, so hopefully my problem will be solved. But I'm curious to know if others have experienced a similar problem.