According to another site:
"To determine a tire's age, check the serial number. On tires made prior
to 1999, the last three digits of the serial number will indicate the week
and year a tire was made.
For example, if the last three numbers are 228, it would mean the tire was
made during the 22nd week of 1998.
Starting this year, tire makers are required to use the last four digits
to indicate week and year. Nonnamaker said that was required when it was
discovered that some tire dealers were selling tires that were more than
10 years old. "
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