['CMV Parts and Maintenance']
['Tires']
09/29/2023
...
As illustrated in 393.75, a 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.
['CMV Parts and Maintenance']
['Tires']
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