What is the result of poor caster angle adjustment?

A poor caster angle adjustment primarily impacts steering stability. Caster angle is the angle formed by the steering axis in relation to a vertical line when viewed from the side of the vehicle. When this angle is off, it can lead to unintended consequences, such as making the steering feel vague or unstable.

With incorrect caster angles, the vehicle may exhibit tendencies to wander or require constant correction from the driver, which can result in a lack of directional stability and a reduced ability to maintain a straight path on the road. This instability is most noticeable at higher speeds or during turns, where improper caster can exacerbate issues in steering response.

In contrast, an adjustment that positively influences caster would typically enhance stability and tracking. Other options reflect negative outcomes but don't directly pinpoint the primary concern associated with inadequate caster settings. For example, increased tread wear, improved ride comfort, or a lack of impact on vehicle performance are indirectly related but do not directly address the core issue of steering stability that arises from poor caster angle adjustments.