Originally Posted by tom2112
A tire specialist once told me that Z rated tires and better start to "cup" as they wear. They made noise and vibrate, and only get worse over time. The only solution is to replace them. So it's really just a wear issue. I had the same trouble with a set of W rated Conti's I had on my other car. As soon as I replaced the tires, all the wobble and noise went away.
That's what I am leaning to. As I stated previously, my G35 Coupe did the same thing at nearly the same milage. You know? This all started after my very long drive from NH to DC.
Thanks everyone for your responses!