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Difficulty: EasyTires, Wheels, and Rims Inspection

An inspector measures the remaining tire tread depths across multiple wheel positions on a commercial vehicle. Which measurement represents a safety violation that prohibits the vehicle from being driven?

  1. A
    A drive axle tire with a tread depth of 3/32 of an inch
  2. A front steering axle tire with a tread depth of 3/32 of an inchAnswer
  3. C
    A trailer axle tire with a tread depth of 4/32 of an inch
  4. D
    A front steering axle tire with a tread depth of 5/32 of an inch

Answer

A front steering axle tire with a tread depth of 3/32 of an inch
Federal safety regulations require a minimum tread depth of 4/32 of an inch in every major groove on front steer tires. A front steering axle tire with 3/32 of an inch fails this safety standard and places the vehicle out of service.

Step-by-Step Solution

1
Identify the minimum legal tread depth standards for commercial vehicle tires by axle position.
Front steering tires require at least 4/32 of an inch of tread depth in every major groove, while all other tires (drive and trailer axles) require at least 2/32 of an inch.
Federal Motor Carrier Safety Regulations establish stricter tread depth thresholds for front steering tires to maintain directional control and prevent hydroplaning.
2
Evaluate each tire measurement against its respective axle threshold to detect any out-of-service violation.
A steer tire with 3/32 of an inch of tread is less than the mandatory 4/32-inch requirement, making it a critical safety violation.
Any measurement below the required minimum constitutes an immediate regulatory failure.

Key Concept

Minimum tire tread depth requirements by axle position
Estimated Time:45s
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Topics

Tires, Wheels, and Rims Inspection

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