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Question

Difficulty: EasyTires, Wheels, and Rims Inspection

During a pre-trip vehicle inspection, what is the minimum allowable tread depth in every major groove for front steer tires on a commercial motor vehicle?

  1. A
    2/32 inch in every major groove
  2. 4/32 inch in every major grooveAnswer
  3. C
    1/32 inch in every major groove
  4. D
    6/32 inch in every major groove

Answer

4/32 inch in every major groove
Commercial motor vehicle safety regulations require a minimum tread depth of 4/32 inch in every major groove on front steer tires to preserve steering traction and prevent hydroplaning.

Step-by-Step Solution

1
Identify the specific wheel position indicated in the pre-trip inspection prompt.
The question specifies front steer tires.
Steer axle tires have stricter legal safety requirements than non-steer axle tires due to directional control risks.
2
Recall the regulatory tread depth standards for commercial motor vehicles.
Front steer tires require a minimum tread depth of 4/32 inch in every major groove.
Maintaining at least 4/32 inch ensures adequate water displacement and reduces the risk of steering failure and hydroplaning.

Key Concept

Tire Tread Depth Inspection Standards
Estimated Time:45s
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Topics

Tires, Wheels, and Rims Inspection

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