Front Suspension Problems of Lexus GS430

I have a 2006 Lexus GS 430 with 17500 miles. When rotating tires at 8000 miles I noticed unusual wear on the inside edge of the front tires. I had the dealership check the alignment. At 17000 miles the wear on the inside edge continued and was a serious safety risk. The wear is difficult to see as it is on the inside edge of the tire and only noticeable with the tire removed on wheel turned full left or right. The wear resembles a groove or channel wearing on the inside edge of the contact patch on the tire. Discount tire inspected the tires and concluded camber wear. This was reported to yokohama who replaced all four tires. Lexus refused to acknowledge any problem and stand firm with a position of normal wear. This is a serious risk as the wear in not easily seen and poses a risk of tire failure at high speed. I feel there might be a design flaw in the suspension, steering, or alignment.

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I own a 2003 Lexus GS 430 vehicle. During the time that I have owned this vehicle, I continue to experience vibration and brake and wheel wear on the front end assembly. The dealership has aligned the front end and changed tires, but the problem is repeating. I believe that the vehicle is improperly designed either to accept 17 in. Tires or to handle a 4. 3 liter engine. The dealership insists that all you have to do is rotate tires every 5,000 miles and there is no problem, but this is not the case. As a result of the run-out and out of balance condition in the front end of the vehicle, the braking is unrepeatable, and, I believe, causes a sever safety concern. The problem happens within 3,000 to 4,000 miles of an alignment. I believe that this problem is endemic to Lexus GS 430's with 17 inch tires and believe that the dealership is not interested in confronting a design problem. I am asking that this be investigated. I also intend to contact Toyota directly.

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