Practice question

What is the minimum legal tread depth required for steering axle (front) tires on a heavy commercial vehicle?

  1. At least 3.2 mm (or 4/32 inch) in major tread grooves
  2. 0.5 mm
  3. 10.0 cm
  4. Steering tires are permitted to be completely bald if drive tires have good tread

Answer: A — At least 3.2 mm (or 4/32 inch) in major tread grooves

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