Tire dating system
Regulations also require the entire DOT Tire Identification Number to be branded on one sidewall while only the letters "DOT" and the first digits of the Tire Identification Number must be branded onto the opposite sidewall (shown below).
Therefore it is possible to see a Tire Identification Number that appears incomplete, yet simply requires looking at the tire's other sidewall to find the complete Tire Identification Number. Without conducting the tests and certifying these tires meet U. requirements, these tires are not allowed to be branded "DOT" (shown below) and cannot be legally driven in the United States.
(Lea en español) When it comes to determining the age of a tire, it is easy to identify when a tire was manufactured by reading its Tire Identification Number (often referred to as the tire's serial number). Department of Transportation (DOT) National Highway Traffic Safety Administration (NHTSA) requires that Tire Identification Numbers be a combination of the letters DOT, followed by eight to thirteen letters and/or numbers that identify the manufacturing location, tire size and manufacturer's code, along with the week and year the tire was manufactured.
Unlike vehicle identification numbers (VINs) and the serial numbers used on many other consumer goods (which identify one specific item), Tire Identification Numbers are really batch codes that identify the week and year the tire was produced. "When it comes to determining the age of a tire, it is easy to identify when a tire was manufactured by reading its Tire Identification Number (often referred to as the tire's serial number)." Since 2000, the week and year the tire was produced has been provided by the last four digits of the Tire Identification Number with the 2 digits being used to identify the week immediately preceding the 2 digits used to identify the year.
Example of a tire manufactured since 2000 with the current Tire Identification Number format: While the entire Tire Identification Number is required to be branded onto one sidewall of every tire, current regulations also require that DOT and the first digits of the Tire Identification Number must also be branded onto the opposite sidewall.
Therefore, it is possible to see a Tire Identification Number that appears incomplete and requires looking at the tire's other sidewall to find the entire Tire Identification Number The use of a partial Tire Identification Number on the one sidewall (shown above) reduces the risk of injury to the mold technician that would have to install the weekly date code on the top sidewall portion of a hot tire mold.
Auto manufacturers have reinvented the wheel with special coatings and finishes, all in an effort to create a low-maintenance, cohesive look.
With all this attention to the wheels, wheel cleaners are more important than ever! Traditional wheel cleaners were formulated to eat grime off bare metal. Mothers Foaming Wheel & Tire Cleaner is designed especially for modern coated wheels.
The powerful cleaner breaks up baked-on tar, dirt, brake dust, bugs, and oil without disturbing the wheels coating.
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.
This means there will be a period of time where there will be both 2 digit and 3 digit plant codes.
So if you purchase new tires that were manufactured exactly two years ago they will be covered for a total of six years (four years from the date of purchase) as long as you have your receipt.
If you lose your receipt, your tires' warranty coverage will end five years from the week the tire was produced (resulting in the tire manufacturer's warranty coverage ending only three years from the date of purchase in this example).
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The 2 digits used to identify the week a tire was manufactured immediately preceded a single digit used to identify the year.