Take a flashlight with you and crawl under the car and inspect the inside walls of the Michelin tires. They have been infamous for bubbles. Make sure yours doesn't have any before you drive it off the lot. Or have them put it up on a rack for inspection.

 

Those bubbles are usually caused by a separation in the sidewall of the tire. That separation usually occurs when there has been a severe impact to the tire causing the sidewalls to push outwards at which time they separate. I've not seen any issues on my Crossfire but I did have an issue with Michelins on another vehicle where this happened.