We purchased a new Toyota Prius that came with yokohama all season radials. Because the tire light came on, I checked the air pressure in the tires and set them to the psi as recommended at about 1000 miles. There was a minor imbalance of 3-4 psi in some tires, but no serious under inflation. We noticed some minor road noise and vibration. We had a mechanic install mud flaps and inspect the tires, wheels, and brakes at about 1500 miles to see if there was a visible reason for vibration. There was nothing obvious. We were concerned about the road noise and about 2000 miles we took the car back to the Toyota dealer who inspected the tires, checked the air pressure, and declared that they didn't see anything wrong. At about 3000 miles driving at a slow speed (35 mph or less) in a school zone, we had a complete blow out of the left rear tire. Fortunately, there was a grassy shoulder and no traffic, so we had no injuries or other damage. The tread appeared to separate and there was a sidewall tear starting at the tread. We returned to the Toyota dealer and also showed the tire to three different tire shops (all three sell yokohama tires). The Toyota dealer did not offer an opinion other than tire defect - so we needed to deal with the manufacturer. Two tire shops thought it was a defect (even though they said it was a hassle to get a replacement paid for by yokohama). One shop reported it was a defect unless the tire was under inflated, but they didn't see any wear pattern that indicated under inflation. Because of the blowout and a second suspicious tire of the four, we replaced all four with a different brand. As far as we can tell, the yokohama tire(s) were defective as new on the car.

- Clearwater, FL, USA