I just had my wheels rotated and balanced at Sams club for the second time. My problem existed from the time the tires were put on through the first rotation. That made me rule out bad rims, out of balance tires ( because I specifically asked for rebalancing on the first rotation). The symptoms before/after the first rotation were identical. Now after the second rotation the vibration has almost completely disappeared??? I am not sure what is going on here. My first thought was that they didn't do anything the first time to the car. I guess the tech could have rebalanced and somehow a back wheel could have had some bad balancing and been moved up front. Not really sure, but it is suspicious. I am glad I didn't start tearing away at my suspension. Had I driven the car at all with the old tires, I probably would have questioned the vibration, but I had the old rotted tires replaced immediately