This means there will be a period of time where there will be both 2 digit and 3 digit plant codes.
To make the transition easier, NHTSA has reserved a series of 3 digits codes starting with the number "1" (One) followed by the previous 2 digit codes.
Once a tire begins to break down, it becomes more likely to fail in the form of a tread separation–often at highway speeds, when the failure is most likely to cause catastrophic injuries or death.
For most tires, this expiration date should be six years from the date of manufacture.
Please drop me a note if you have a topic you want to see: [email protected] Tire Update April 2015: NHTSA (National Highway and Traffic Safety Administration), the branch of the US government that regulates tires (and in this case, what is required to appear on the sidewall), has annouced that they have run out of 2 digit plant codes (see below) and are making a change to a 3 digit plant code.
I have updated the web page to reflect those changes.
It is NOT required that everone use this coding system, but I expect everyone to do so.
All Kumho tires are manufactured to a rigid set of manufacturing standards.
Sunlight, heat, ice, and general wear and tear can accelerate the breakdown of a tire.The first 2 or 3 digits are a code for the manufacturing plant.Prior to April of 2015, all plant codes were 2 digits, but after April of 2015, a third digit was permissible, and 3 digits are required by April of 2025.For tires manufactured prior to the year 2000, three numbers instead of four indicate the date of manufacture.Also, during the early 1990’s, Continental added a triangle (◄) to the end of the character string to distinguish a tire built in the 1990’s from previous decades (e.g., a tire with the information "DOT XXXXXXX274◄” was manufactured in the 27th week of 1994).In the unlikely event of a tire recall, it's necessary for us to have your contact information on file, so that Kumho Tire USA can notify you quickly.