DOT number

DOT number
The symbol DOT on a tire means it meets or exceeds Department of Transportation safety standards. Following DOT are a maximum of eleven numbers. E.g., "DOT FT TW A2NX 092." ("DOT" = meets or exceeds federal standards; "FT" = identifies manufacturing plant; "TW" = the code for tire size; "A2N" or "A2NX-3" or optional 4 digits = manufacturer's code to identify the characteristics of the tire; "092" = Week of mfg., in this case, 9th week of 1972. Prior to May 22, 1971 the manufacturer's plant was identified by only three numbers (Example DOT 129). Retreaded tires must also have a new serial number and can be determined by the letter "R" following DOT letters.

Dictionary of automotive terms. 2015.

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