Rotational Noise

dmenges

I have a 2012 370Z A7. Last July I put on some new rubber... Michelin Pilots... Recently I've been hearing a rotational noise coming from the left rear area. It sounds like a tire noise although there is no abnormal wear or any kind of physical ramifications. No vibrations. Nothing. I brought the car to the dealer and they checked the bearings and said it was a tire noise. I took the car to the garage where I got the tires and they worked with me by switching the rear tires. Same noise left rear. They replaced each of the tires, one at a time, with the donut spare and each time the noise continued in the left rear. I'm not sure what to do. Noises like this drive me crazy and make it not fun to drive my toy! I just put it away for the winter so I'll have to fight with it next spring. Any ideas????