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I don't think this is too unusual, except for how it happened, and I know your are very lucky. Tires may fail if you hit that chuckhole just right or may be from a piece of sheet metal that you ran over that you didn't see. It may have been the just the tire.
How old was the tire? I won't drive on a tire more than four years old. The worst I ever saw on my tires were a few tread delaminations and two catastrophic failures due to chuckholes. It may have been just the tire, a bad production run.
"never checked the tire pressure" No comment other than under inflation helped cause the Firestone/Ford SUV problems.
You don't know if it was a bad run of tires. Based on that I would consider replacing any tire that has the same date code. If you bought it retail you may have a replacement warrantee. (Edit note - just relaized that you did not buy the tires.) Even if it is not under a warrantee, if they don't replace the tire or all the tires with the same date code (DOT code) you may want to contact the Michelin distributor.
I am running Michelin tires on two of my cars and sticking with them.
I found this in the internet:
How do I know how old my tires are?
Each tire has a required Department of Transportation number imprinted on at least one of its sidewalls. That number begins with the letters "DOT" and may contain up to 12 additional numbers and letters.
The first and last digits are the most important for the tire owner. The first 2 letters/numbers identify the manufacturer of the tires. Prior to the year 2000, the last 3 digits of a DOT number represented the week (2 digits) and the year (1 digit) of production.
For example, if the last three digits are 439, the tire was produced in the 43rd week of 1999. Tires produced after January 1, 2000 have a 4-digit date code at the end of the DOT number. The first 2 digits represent the week of production and the last 2 digits represent the last 2 digits of the year of production. So, 3500 as the last 4 numbers indicates that the tire was produced in the 35th week of the year 2000. http://tires.michelin-us.com/care/tire_saving_tips/maintaining/maintaining_b.html
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Tom F
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