Driving surface was paved dry two lane route. speed approximately 40 miles per hour. left rear tire catastrophically failed. the steel belled tread became totally (100%) detached for the interior side wall of tire. tire was bridgestone turanza (t0506) el4pnz 215/45zr17. this is the second tire in less than a month that has had a side wall failure. i had already replaced a tire earlier in the summer of 2013 for side wall failure. three out of four tires have had similar failures in less than a year. *tr