Ever wonder how old your tires are? Here's some help reading the DOT code which is cast into one of the outer sidewalls. Find the DOT followed by 4 letters/numbers. Following this Dot code will be a string of letters/numbers. You are concerned with the last 4 numbers in this string. In the following picture, the numbers are 5107. Interpreted to meaning that this tire was manufactured in the 51st week of the year 2007 (51 & 07). Hope this helps.
Jim