Tire Bubble problems of the 1998 Saturn SL

The contact owns a 1998 Saturn Sl, equipped with summit sienpre 6 tires, size 185/65/r15. The contact stated that he noticed that the rear driver and passenger tires had developed large bubbles in them. The vehicle was not inspected by a dealer or an independent mechanic. The manufacturer was made aware of the failure. The tires were not replaced. The failure and current mileages on the tire were approximately 30,000. The failure and current mileages on the vehicle were approximately 125,000.