jbbor, there are a few questions you need to answer in order to determine the cause of the vibration. After 30 + years in the industry I've seen all kinds of problems balmed on tires. Let me list a few things that you may want to notice going forward. How old are the tires? If a tire is out of round which can caus vibration it is that way from the day it's built. The vibration can not be compensated for with balancing. At one time the industry would "shave" or true tires. Un heard of for years. If the tires are bad they are covered by warranty go to a independent Michelin dealer. If you wnat some advice on the problem send me an email adn we can talk in depth to help resolve your problem.