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Tread depth must never be less than ______ inches

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Final answer:

The minimum tread depth should be 15 inches.

Step-by-step explanation:

Tread depth must never be less than 15 inches.

An older "rule of thumb" was 5 side-to-side and 7-8 deep, but newer work suggests as much as 8 diameters side-to-side and 15 diameters deep.

User Damiana
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