Major tread groove

Major tread groove is the space between two adjacent tread ribs or lugs on a tire that contains a tread wear indicator or wear bar. (In most cases, the locations of tread wear indicators are designated on the upper sidewall/shoulder of the tire on original tread tires.)


49 CFR § 393.5

Scoping language

As used in this part, the following words and terms are construed to mean:

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