On a road surface in good condition, the steering wheel vibrates particularly at certain speeds. Which of these mechanical causes may produce this?

Correct answer

Unbalanced wheels.

Unbalanced wheels may transmit vibrations to the steering wheel, particularly at certain speeds. Balancing corrects mass distribution in the wheel-and-tyre assembly; alignment corrects steering and suspension geometry. Persistent vibration requires professional inspection to identify its cause, rather than continuing to increase speed.