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DOT marking serves as the tire's fingerprint and signifies compliance with U.S.Department of Transportation Tire Safety Standards.
Example: DOT M5H3 459X 063
The first two characters M5 designate the tire's manufacturer and plant code. The third and fourth characters denote the tire size. The fifth, sixth, seventh and eighth (optional) characters identify the brand as well as other significant characteristics. The final three numbers (four numbers, beginning in 2000) denote the date the tire was produced, with the first two indicating the week, and the last number indicating the year (063 indicates the tire was built in the 6th week of 2003).
It's important to note that markings do not always appear exactly as they do in this example, as tires can be certified under a variety of designations.
Purchase an accurate pressure gauge, as it's impossible to tell how much air is in the tire by looking at it. The gauges attached to air hoses may not be accurate. It is normal for all tires to lose air over time.
The pressure should never be below the recommended pressure listed on the vehicle placard nor above the maximum branded on the sidewall of a specific tire in normal driving conditions.
Each tire manufacturer isresponsiblefor designating the rating of each of its tires. LT designated light truck tires do not have UTQG markings.
The Uniform Tire Quality Grade (UTQG) offers three more key pieces of information about a tire:
Lufkin, TX
Nacogdoches, TX
Livingston, TX
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