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SUMMARY: The tire identification number (TIN), which must appear on virtually all new and retreaded motor vehicle tires sold in the United States, plays an important role in identifying which tires are subject to recall and remedy campaigns for safety defects and noncompliances. This final rule makes two amendments to the TIN. First, because NHTSA has run out of twosymbol codes to identify new tire plants, NHTSA is expanding the first portion of the TIN, previously known as the manufacturer identifier, but more commonly referred to as a ''plant code,'' from two symbols to three for manufacturers of new tires. This amendment substantially increases the number of unique combinations of characters that can be used to identify individual manufacturers of new tires. Second, NHTSA is standardizing the length of the tire identification number to eliminate confusion that could arise from the variable length of tire identification numbers. This final rule standardizes the length of the TIN at 13 symbols for new tires and 7 symbols for retreaded tires, making it easier to identify a TIN from which a symbol is missing.