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Difficulty: MediumTires, Wheels, and Rims Inspection

When examining the wheels and tires of a combination vehicle prior to departure, which set of tread depth measurements satisfies the minimum legal safety requirement?

  1. A
    The steering axle tires have a tread depth of 2/32 inch, and the drive axle tires have a tread depth of 4/32 inch.
  2. B
    All tires across both the steering axle and the drive axles maintain a uniform tread depth of 3/32 inch.
  3. The steering axle tires have a tread depth of 4/32 inch, and the drive axle tires have a tread depth of 2/32 inch.Answer
  4. D
    The steering axle tires have a tread depth of 5/32 inch, and the trailer axle tires have a tread depth of 1/32 inch.

Answer

The steering axle tires have a tread depth of 4/32 inch, and the drive axle tires have a tread depth of 2/32 inch.
Federal commercial motor vehicle safety regulations require a minimum tread depth of 4/32 inch in every major groove on front steer tires and a minimum of 2/32 inch on all other tires (drive, tag, and trailer axles). The option providing 4/32 inch on the steer axle and 2/32 inch on the drive axle fulfills both minimum criteria.

Step-by-Step Solution

1
Identify the minimum legal tread depth requirement for front steering axle tires.
Front steering tires must have at least 4/32 inch of tread depth in every major groove.
Steering tires handle critical directional control and hydroplaning resistance, requiring deeper tread.
2
Identify the minimum legal tread depth requirement for all other non-steer tires (drive and trailer axles).
Non-steer tires must have at least 2/32 inch of tread depth in every major groove.
Federal Motor Carrier Safety Regulations establish 2/32 inch as the safe operational baseline for drive and trailer wheels.
3
Evaluate the measurement combinations to find the set meeting or exceeding both standards.
4/32 inch on steer tires and 2/32 inch on drive tires satisfies both regulatory thresholds.
Both values match the exact minimum legal criteria without violation.

Key Concept

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

Tires, Wheels, and Rims Inspection

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