ORGINIAL EQUIPMENT ON A 1998, BUICK, LESABRE ,TIRE SIZE P20570R15, WHITE WALLS, TIRES HAVE 40 THOUSAND MILES ON THEM. WHEN DRIVING 50 MPH, RIGHT REAR GENERAL AMERI G4S DOT A3M0DB1427 TIRE EXPLODED, PIECES OF THE TREAD WAS STILL ON THE RIM. PLEASE PROVIDE ANY FURTHER DETAILS.*AK *SLC