What component can cause "toe wear" on tires if it is worn or loose?

The component responsible for causing "toe wear" on tires when it is worn or loose is the tie rod ends. Tie rods connect the steering rack to the steering knuckles, allowing for proper steering and alignment of the vehicle's wheels. When tie rod ends are not functioning correctly, they can lead to improper alignment, specifically affecting the toe angle, which is the angle of the tires in relation to the centerline of the vehicle.

Excessive play or wear in tie rod ends will not maintain the tire's alignment as intended, resulting in the tires pointing either too inward or outward. This misalignment leads to uneven tire wear, commonly referred to as "toe wear." It is crucial to have tie rod ends in good condition to ensure safe handling and longevity of tire life.

Other components, while crucial to suspension and steering, typically affect different aspects of alignment or vehicle handling. Lower control arms and ball joints primarily influence camber and caster angles, while sway bar links are designed to stabilize the vehicle during turns and do not directly affect tire alignment in terms of toe.