Which of the following would NOT cause tire wear if not within manufacturer's specifications?

Caster is primarily related to the steering axis and affects the stability and steering feel of the vehicle rather than directly influencing tire wear. It helps to keep the tires in contact with the road, particularly during cornering maneuvers, but it does not cause uneven wear patterns on the tires if not adjusted properly. The manufacturer’s specifications for caster primarily focus on vehicle handling characteristics and overall driving experience rather than tire longevity.

On the other hand, wheel balance, toe-in, and camber all significantly affect how tires wear over time. Wheel imbalance can lead to vibrations, causing uneven wear. Improper toe-in can cause the edges of the tires to wear out more quickly, while incorrect camber (tilting of the wheels inwards or outwards) results in accelerated wear on one side of the tire. Therefore, maintaining alignment settings like toe and camber is crucial for tire longevity, while caster primarily impacts vehicle dynamics rather than tire wear.