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Difficulty: MediumTires, Wheels, and Rims Inspection

Federal safety regulations mandate specific minimum tread depth thresholds measured in every major groove to maintain vehicle control and prevent traction failure. What are the minimum legal tread depths required for the front steer tires compared to all other tires on a commercial motor vehicle?

  1. A
    At least 2/32 inch on front steer tires, and at least 4/32 inch on all other tires
  2. B
    At least 2/32 inch uniformly across all tires, including steer, drive, and trailer axles
  3. At least 4/32 inch on front steer tires, and at least 2/32 inch on all other tiresAnswer
  4. D
    At least 4/32 inch uniformly across all tires on every axle of the vehicle combination

Answer

At least 4/32 inch on front steer tires, and at least 2/32 inch on all other tires
Federal commercial motor vehicle safety regulations require a minimum tread depth of 4/32 inch in every major groove on front steer tires to ensure sufficient steering control and prevent hydroplaning. All other tires, such as those on drive and trailer axles, must maintain a minimum tread depth of 2/32 inch.

Step-by-Step Solution

1
Identify the minimum legal tread depth requirement for front steer axle tires
Steer axle tires require a minimum tread depth of 4/32 inch in every major groove
Front steer tires require greater tread depth to channel water effectively, resist hydroplaning, and provide steering traction.
2
Identify the minimum legal tread depth requirement for non-steer tires (drive and trailer axles)
All non-steer tires require a minimum tread depth of 2/32 inch in every major groove
Secondary and trailer wheel positions have a lower legal threshold of 2/32 inch before reaching out-of-service limits.

Key Concept

Commercial motor vehicle tread depth minimum regulatory standards
Estimated Time:1m 0s
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Topics

Tires, Wheels, and Rims Inspection

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