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Difficulty: MediumTires, Wheels, and Rims Inspection

Dual tires mounted on a commercial vehicle axle may legally make physical contact along their sidewalls when carrying a maximum rated payload, provided both tires maintain proper cold inflation pressure.

Answer: Answer

Answer

False. Dual tires must never touch each other or any vehicle component, regardless of load or inflation pressure.
The statement is false because commercial vehicle safety regulations strictly prohibit dual tires from touching each other or any part of the vehicle. When dual tires touch, constant friction between the flexed sidewalls generates dangerous levels of heat that can rapidly destroy the tire casing, ignite a tire fire, or cause a sudden catastrophic blowout at highway speeds.

Step-by-Step Solution

1
Review commercial vehicle inspection standards regarding dual tire mounting and spacing.
Dual tires must maintain sufficient clearance and are prohibited from contacting each other or vehicle body parts.
Clearance is mandatory to prevent sidewall rubbing.
2
Assess the claim that heavy payload and proper inflation permit sidewall touching.
The claim is false; contact is an out-of-service defect under all operating and loading conditions.
Continuous contact generates hazardous friction and heat buildup during highway travel.

Key Concept

Dual tire spacing and sidewall contact safety standards
Estimated Time:45s
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Topics

Tires, Wheels, and Rims Inspection

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