Which of the following is a common cause of wheel vibration or shimmy?

• A. Unbalanced wheel, tire, or misalignment
• B. Low fuel level
• C. Faulty engine sensor
• D. Worn seat cushions

Answer: (A)

Wheel vibration or shimmy comes from uneven rotation forces in the wheel area. The most common cause is an imbalance in the wheel and tire, or a misalignment in how the wheel sits relative to the vehicle. When a wheel is heavy at one spot, that spot cycles through the suspension every revolution, creating a repeating vibration that you feel in the steering wheel and sometimes through the seat or pedals, especially at certain speeds. If the wheel is not aligned properly—for example, toe or camber out of spec—the tire doesn’t contact the road evenly, which also produces shaking or a sketchy steering feel.

So the usual fix is to balance the wheels and tires and correct any misalignment, and to check for any bent rims or damaged tires. By contrast, low fuel level, a faulty engine sensor, or worn seat cushions don’t produce the classic wheel shimmy pattern.