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Difficulty: MediumTires, Wheels, and Rims Inspection

A commercial truck driver performs an equipment check on the tandem drive axle wheel assemblies of a tractor-trailer. Which of the following conditions complies fully with commercial motor vehicle safety regulations?

  1. Mounting sound, properly matched retread tires on the drive axle positions.Answer
  2. B
    Pairing a radial tire and a bias-ply tire together on the same dual wheel set.
  3. C
    Operating with dual tires that make physical contact with each other under load.
  4. D
    Using a steel wheel rim that has been repaired by welding over a fatigue crack.

Answer

Mounting sound, properly matched retread tires on the drive axle positions is compliant with commercial vehicle safety standards.
Federal safety regulations allow the use of sound, properly matched retreaded (recapped) tires on non-steering axles, including the drive and trailer axles of freight commercial vehicles.

Step-by-Step Solution

1
Evaluate commercial motor vehicle safety standards regarding tire construction and wheel maintenance.
Identify prohibited conditions including mixing radial and bias-ply tires on an axle, dual tire sidewall contact, and welded rim repairs.
Federal safety regulations strictly ban unsafe wheel repairs and hazardous tire mismatches to maintain vehicle stability and prevent catastrophic failure.
2
Determine the regulatory permissibility of retread (recapped) tires across axle positions.
Confirm that retread tires are standard and fully authorized on drive and trailer axles of freight transport vehicles.
While retreads are prohibited on the front steering axle of passenger-carrying buses, they are completely legal on freight truck drive axles when properly matched and in good repair.

Key Concept

Drive Axle Tire and Wheel Regulatory Compliance
Estimated Time:1m 0s
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Topics

Tires, Wheels, and Rims Inspection

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