2006 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. *TR

PREMATURE TIRE WEAR ON 2006 LEXUS GS430. INSIDE SHOULDER OF EACH TIRE PREMATURELY WEARS IN A "SCALLOPING" FASHION. DEALERSHIP IS AWARE OF THE ISSUE, SAYS IT IS DUE TO THE SPORT SUSPENSION AND IT HAPPENS ON ALL THEIR "SPORTY" MODELS. DEALERSHIP CONCEDES THAT PROPER ROTATION, BALANCE AND ALIGNMENT MAINTENANCE DOES NOT CORRECT THE ISSUE. I WAS TOLD BY THE DEALERSHIP THAT 20,000 MILES ON ANY TIRE IS WHAT SHOULD BE THE EXPECTED TIRE LIFE. THEREFORE THERE SEEMS TO BE NO CORRECTION FOR THE FAILURE OFFERED, AT ANYONE'S EXPENSE. PRIMARY SAFETY RISK IS DUE TO THE LOCATION OF THE PREMATURE WEAR, WHICH IS NOT EASILY VISIBLE (INSIDE SHOULDER OF EACH TIRE). THERE ARE NUMEROUS BULLETIN BOARDS ONLINE, INCLUDING ON THE LEXUSOWNERS WEBSITE, WHICH CONFIRM THAT THIS IS A WIDESPREAD ISSUE WITH THE ENGINEERING OF THE SUSPENSION ON MANY LEXUS MODELS. *TR