Automotive Diagnostics, Torque & Trailer Wiring

What is the legal minimum tire tread depth in most jurisdictions, and what gauge measures it accurately?

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 Correct Incorrect2/32 of an inch (1.6 mm), measured with a calibrated sliding pin tire tread depth gauge or checked against built-in wear indicator bars in the tire grooves.

What is the legal minimum tire tread depth in most jurisdictions, and what gauge measures it accurately?

• 1/2 inch measured with a ruler
• 2/32 of an inch (1.6 mm), measured with a sliding tire tread depth gauge
• 0/32 of an inch (bald smooth)
• 4/32 of an inch measured with calipers