It's a code on the sidewall which tells you what month and year the tire was made. Rubber deteriorates from ozone in the air even when the tire isn't being run. Most companies recommend having tires inspected for road worthiness, even if they have good tread, after five years of age and replacing them regardless of tread left when they're seven years old. Once they're seven years old, normal rubber deterioration is such that they aren't considered safe to drive any longer..
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