I purchased new tires at infiniti of coconut creek september 2012. there is a vibration and noise at low speed, below 30 mph. i took it back to the dealer numerous times and was told it is not the tires, it is the suspension that is loose and i will just have to live with it. per the dealer, infiniti knows there is a problem with the suspension on the qx56 and the armada and there is no fix. they will not replace the suspension. *tr