Why did Volvo choose to put the Pirelli P Zero Rosso's on our cars? After finally getting fed up with the headache-inducing beat from my tires, I took the rears to get balanced again. It turns out that the tire itself is warped sideways. I asked to see the tire on the balancing machine, and sure enough there was maybe 5mm side to side motion on the tire. I'm not willing to risk my life or car to extract another season out of these tires, so I just ponied up for a set of 245/40YR18 Goodyear Eagle F1 Asymmetrical summer tires. I can't wait for these to arrive, every review has said great things about the performance and even greater things about how darn quiet they are. I had the Goodyear Eagle F1 GS-D3's on my last car (VW Passat), and they were absolutely fantastic. I'm glad I will finally have a luxury car that performs AND in which I will be able to carry out a conversation. In any case, it still boggles me that the OEM Pirelli's were so bad. They came out 7th out of 11 overall in Car & Driver's last review, and were 2nd to last in the lateral grip category, which is...uhh...just about the most important thing in a sports sedan. I hope the Goodyear's don't disappoint.