that's interesting..I too came across something similar, got new tires in September and the car vibrated, took it to 2 different places, both noted one rim out of round, took it to the dealer and because the finish was chipping were able to warranty the wheel, while changing the wheel the tech advised the new tire on the opposite side was out of round. Went to the place where they installed the tires and they said there was nothing wrong! he said do you want to come see? I said sure! well, once he started spinning I could see the tire hop and told him, I see the tire out of round, he said none are ever perfectly round! I told him...change the tire, the ordered a new one I got in touch with Michelin and advised the shop wanted to charge for installation,I complained that I already paid once and the tire is defective, they said they would cover the cost.I called the shop to see if they had the new tire and he said "yes", made an appointment for tomorrow, also advised him that Michelin will cover the cost of installation, he said he never heard of that before, I gave him the reference number that Michelin gave me, hopefully he follows up with Michelin to confirm!