What tires were you running? What age?
If they were ST tires, then you may have been a bit over the limit:
Industry standards dictate that tires with the ST designation are speed restricted to 65 MPH under normal inflation and load conditions unless a different speed restriction is indicated on the sidewall of the tire.
How old were the tires? Mine failed after 3.5 years of use, but the tires were 4.5 years old. Contributing to my failure was the high temperature (97F), high speed (DW was doing 65) and a pop hole an hour before the failure.
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