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Question

Difficulty: EasyWheels and Tires

When cruising at highway speeds of 55 to 65 mph, a driver experiences a noticeable rhythmic vibration in the steering wheel, but the vibration subsides at lower city driving speeds. Which condition is the most likely cause of this symptom?

  1. A
    Unevenly worn brake friction pads
  2. An out-of-balance front wheel assemblyAnswer
  3. C
    A broken rear suspension leaf
  4. D
    A malfunctioning rear differential unit

Answer

An out-of-balance front wheel assembly
An out-of-balance front wheel assembly produces an uneven distribution of weight around its axis of rotation. At highway speeds, this mass imbalance generates substantial centrifugal force that translates into an oscillating steering wheel vibration.

Step-by-Step Solution

1
Analyze the reported symptom and conditions
Vibration is felt in the steering wheel at highway speeds (55-65 mph) and disappears at lower speeds without braking.
Speed-sensitive mechanical vibration indicates rotating mass imbalance rather than braking or structural alignment faults.
2
Identify the rotating component connected directly to the steering system
The front wheel and tire assemblies rotate at high speeds and transfer dynamic forces directly into the steering knuckles and tie rods.
When a heavy spot exists on a front tire or wheel, centrifugal force causes wheel hop or shimmy that peaks within standard highway speed ranges.

Key Concept

Wheel and tire dynamic balance diagnostics
Estimated Time:45s
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Topics

Wheels and Tires

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