Determine the Age of Tires

By law, every tire is supposed to have a 10 to 12 digit DOT serial number. If you know how to read this code, you'll know how old your tire is. Let's say the serial number is DOTMK87FOWR4201

DOT - means the tire has passed the Department of Transportation's safety test.

MK - this is DOT's tire plant code.

87 - this number represents the tire size.

FOWR - manufacturer's tire brand

4201 - the week of the year when the tire was made and the year when it was made. In this example, the tire was made on the 42nd week in 2001.