I had some 12-year old Pirelli P7R's split open on me within the first 50 miles.
They looked brand new, had never been mounted, and still had the little rubber nipply things. I was fortunate in that I was going pretty slow at the time, heard a huge "BANG" and stopped to investigate. It split right between the treads.
Like the movie says, "Are you feeling lucky?" I know how I answer that question from now on...
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