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Zorluk: OrtaTires, Wheels, and Rims Inspection

A fleet safety manager audits tire measurements recorded across a tractor-trailer combination unit prior to highway dispatch. Which of the following tread depth measurements complies with minimum federal commercial vehicle safety standards?

  1. A
    A front steer tire measuring 2/32 inch of remaining tread depth in every major groove
  2. B
    A tandem drive tire measuring 1/32 inch of remaining tread depth across its center grooves
  3. A steer axle tire measuring 4/32 inch of remaining tread depth in every major grooveCevap
  4. D
    A trailer tire measuring 3/32 inch in outer grooves but 1/32 inch in an inner major groove

Cevap

A steer axle tire measuring 4/32 inch of remaining tread depth in every major groove
Federal commercial motor vehicle safety regulations stipulate that front steer axle tires must have at least 4/32 inch of tread depth in every major groove, whereas all other tires must have at least 2/32 inch. Therefore, a steer axle tire with 4/32 inch of tread depth in every major groove meets the required safety threshold.

Adım Adım Çözüm

1
Identify the minimum federal tread depth requirements for each axle position.
Front steering tires require at least 4/32 inch in every major groove, while all other tires (drive and trailer axles) require at least 2/32 inch in every major groove.
Commercial motor vehicle safety regulations enforce stricter tread depth minimums on steering axles to prevent loss of steering control and hydroplaning.
2
Evaluate the measured values against legal thresholds.
A steer axle tire with 4/32 inch in every major groove satisfies the minimum requirement exactly.
Any measurement below 4/32 inch on a steer tire or below 2/32 inch in any major groove on non-steer tires is a regulatory safety violation.

Anahtar Kavram

Commercial Motor Vehicle Tire Tread Depth Regulations
Tahmini Süre:1m 0s
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Tires, Wheels, and Rims Inspection

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