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Tire Concerns: tire dry rot

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Your Tires
by: Wheels Etc

The 4 1/2 years since you bought the tires may not accruately describe the true age of the tires. It is possible these tires were in some dealer's inventory up to 5 years before you bought them. It is easy to tell how old the tires are by reading the last 4 digits of the DOT number. That number is on the sidewall of each tire and with Michelin the last 4 normally follow a signiture X. Those digits represent the week and the year of manufacuture. 4 1/2 years ago would be 2407 or thereabouts. You do realise the number on your tires will be older than that just because the tires had to be shipped and distributed before the dealer had them in stock.
it is important to understand tires over 6 years are considered too old for continued use but I have never come to that understanding. My own tires are more than 10 years old and in very good condition. I have had tires fail on customer's cars within the 6 years suggested by the industry. I see used tires with less than 5 years that have cracked on the sidewall and I believe that is a result of exhaust being directed at them while driving.

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