Tire Bulge problems of the 2002 Audi A4

: the contact stated while traveling 60 mph on a dry and flat interstate, the rear passenger side tire blew out, causing the vehicle to swerve to the left and almost collided with a median. Upon inspection, it was noticed that the whole sidewall had separated from the tread, and the front driver side tire had small spots where the tread joined the sidewall. A donut tire replaced the defective tire. On 09/18/06, the tire manufacturer was contacted, and suggested that the vehicle be taken to a tire dealership. The vehicle was taken to the dealer, who agreed that the tire was defective but offered no resolution. The manufacturer suggested that the defective tires be sent in for inspection and that 4 new tires should be purchased. The tires were regularly checked for correct pressure, and rotated on time. The contact did not notice any vibrations while driving. There was no abnormal bulging in the tires. Prior to the incident, the contact noticed that the sidewalls on the front driver and rear passenger side tires were cracked.