All tires sold in the US require a DOT code which is mandated by the U.S Department of Transportation. The DOT code indicates the tire meets all federal standards, these identification numbers are important if the product is recalled. It is recommended to replace all trailer tires every 3-7 years. When purchasing new trailer tires discuss the vendors product in terms of age, to ensure the product that you are receiving has been recently manufactured.
To find your tire's date code, identify the code on the tire that begins with 'DOT'. The 'DOT' should be followed by a series of four letters and/or numbers.
You will find the 4-digit date code following this set of letters and/or numbers. It will be a 4-digit code containing all numbers.