Tire Sidewall problems of the 2009 Ford F-150

Michelin had a safety recall for dot b99y 56ex 3812-2113 of its ltx m/s p275/55r20 111t for "affected tires could have partial or full sidewall perforations that could cause them to experience loss of air pressure ' I purchased the ltx m/s p275/55r20 dot b79y 56ex 1913 made in the same time frame for my 2009 Ford F-150 on 06/08/2013. On August 23, 2016, while on a 70mph highway, I suffered a blowout. The entire anterior sidewall was affected with many chunks of the tire missing, while the interior sidewall was totally unaffected. I am careful with my tire pressures and rotation. None of the tires show uneven or odd wear. I don't believe I ran over anything. I have all four tires in my possession and available for inspection. I think michelin has a greater problem than the dot range of their voluntary recall. I think the dot needs to be aware of this so that if this proves to be a more widespread problem, michelin can be required to recall all affected tires.

The side wall of tires with approximately 30,000 miles and 4 years old are pealing off. I purchased 4 tires when the vehicle had a little over 30000 miles. 2 were ok. The other 2 the sidewall pealed off in chunks. I have pictures of the tires. Michelin offered 65% discount on new tires a year ago. 11 months and 10,000 miles later they offered only a 22% discount. They indicated I used up 43% of the tire life in 11 months and 10,000 miles.

I took my 2009 Ford F-150 into les schwab for a tire rotation and they pointed out that all four of my hankook dynapro atm lt285/55-20 rf10 tires with dot # t7vwrfh4510 have approx. 1-1 1/2" cracks around the entire tire where the tread meets the sidewall. The tires have approximately 28,000 miles on them and still have aggressive tread life. Les schwab recommended replacing and did not have an answer as to why/how this occurred.