Ok, I blew it. I didn`t rotate my forteras on my 08 acadia until now at 38k miles. It`s my wifes vehicle and I just spaced it off. I started to hear a humm coming from the rear and decided to rotate. You guessed it. The humm is in the front now. My tire guy says they may wear in in 4 0r 5 thousand miles and stop humming. any experience with this out there? As some of you may have found out, forteras are the only 18`s out there and they are very expensive.