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Question

Difficulty: MediumTires, Wheels, and Rims Inspection

While conducting a pre-trip inspection on a straight truck, a driver records tread depth measurements and tire conditions across multiple wheel positions. Which of the following recorded conditions meets federal commercial motor vehicle safety standards for legal operation?

  1. A
    A front steer tire measuring a remaining tread depth of 3/32 inch across all major grooves
  2. A drive axle tire with 3/32 inch of remaining tread depth in every major groove and no exposed cordAnswer
  3. C
    A drive axle dual tire measuring 1/32 inch of tread depth in one major groove and 3/32 inch in the adjacent groove
  4. D
    A steer axle tire with 2/32 inch of tread depth that exhibits even wear and proper inflation pressure

Answer

A drive axle tire with 3/32 inch of remaining tread depth in every major groove and no exposed cord
Federal commercial motor vehicle safety regulations mandate that non-steer axle tires (drive and trailer positions) must maintain at least 2/32 inch of tread depth in every major groove. Because the drive axle tire measures 3/32 inch across all major grooves and has no ply or fabric exposed, it satisfies all safety criteria for legal highway operation.

Step-by-Step Solution

1
Recall federal minimum tread depth standards by axle position
Steer axle tires require a minimum of 4/32 inch in every major groove, while all other tires (drive, trailer) require a minimum of 2/32 inch.
Different axle positions have distinct regulatory safety requirements due to steering control criticality.
2
Evaluate each tire condition against its respective axle threshold and groove requirements
The steer tire conditions at 3/32 inch and 2/32 inch fail the 4/32-inch requirement; the drive tire with 1/32 inch in one major groove fails the 2/32-inch rule; the drive tire with 3/32 inch across all major grooves meets the minimum standard.
All major grooves must meet the minimum standard for the specific axle position with no cord or fabric exposed.

Key Concept

Commercial Motor Vehicle Minimum Tread Depth Regulations
Estimated Time:1m 0s
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Topics

Tires, Wheels, and Rims Inspection

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