Excessive wear on one side of the tire is a result of what type of alignment issue?

Excessive wear on one side of the tire is primarily indicative of an improper toe angle. When the toe angle is not adjusted correctly, it can cause the tires to either point inward or outward relative to the vehicle's centerline. This misalignment leads to uneven contact with the road surface, resulting in accelerated wear on one side of the tire.

For example, if the toe is set too much toward the center of the car (toe-in), the outer edges of the tires will experience more contact and wear more quickly. Conversely, if the toe is set too far outward (toe-out), the inner edges of the tires will wear down faster. This issue not only affects tire longevity but can also lead to poor vehicle handling and stability, affecting overall safety.

While camber adjustments can also affect tire wear—specifically, excessive positive or negative camber can cause wear on one side—the term " excessive wear on one side of the tire" most directly aligns with toe angle issues, making improper toe angle the more accurate identification of the problem regarding the context of the question.