Tire Tread/belt Problems of Lexus SC430

I have an Lexus Sc430 2004 with 40k miles on it. I have repeatedly put new tires on the car. The dealership is telling me, that's the way the tires are going to wear because its a so call sports car. The tires is wearing down to the wire on the inside of all the tires about every 7,000-8,000 miles. It's not safe and it's $356 a tire.

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On March 7, 2005 the caller was traveling at 75 mph and without warning a tire separated from the rim about 2 inches. He said it happened again on September 10, 2005. He was going about 70 mph. It happened both times to the driver's side. Dealer asked, the first time, if he hit something and they fixed it by giving him a new rim and tire. Dealer has vehicle now for the second time. Manufacturer has not been contacted yet.

About a year ago I bought a 2002 Lexus SC 430 hardtop convertible. The tires had to be replaced at 11,000 miles because the inside tread was cupping and making horrendous growling and vibration noise. I called Lexus and the factory rep came out and talked to me and said they all do the same thing and the problem can't be fixed. I could not see the problem and the tires looked perfect until you removed them and examined them. My worry, apart from the $2,000. 00 to replace the tires is that the vibration of the tire at high speed could cause a failure. I feel that Lexus knowingly sold a car with an inherent defect in the steering which could cause serious harm if not fixed. Lexus gave me a new set of tires but I don't believe they should get a pass on this.

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