I experienced a vibration at 60mph on my 2006 300c. This occured at 17,065 miles. My five-star Chrysler dealer found the factory installed Goodyear Assurance tires had runout on each of the them. My tire preference for years has been with Michelin. I located four of the new Michelin Primacy MXV4 225/60R/18 at my local Merchant dealer. The new michelins would not fit on the factory 300C wheels. While the tires were the same size, the factory wheels has a double bead that would not allow the tire to seal. I didn't believe this until I watched the dealer try to mount the Michelins on the wheel. Merchant located a set of the Goodyear Assurance. They fit without a problem. This is UNREAL!