how to determine the age of a tire
News & Features. How to determine tireâs age. Check your sidewall, and look for the serial number. The last four numbers will determine the. production date of the tire. First two numbers will tell you the week, the last two numbers, the. year of production. So if the last four numbers are 2209, production date is 22nd week of 2009. If it is 1014, production date is 10th week of 2014.