Just this weekend I had an "Inner Tread Separation" (That's what the tire shop said) on my front driver side, was driving down the freeway at 60 mph and all hell broke loose with major vibration, lucky the next exit had a tire shop. I had a look at the tire and outside looked fine but once they took it off the rim I was surprised at the amount of rubber destroyed on the inside
Had maybe 3,000 miles on the front tires.