What could cause front tires of a truck to show feather-edged wear?

Feather-edged wear on front tires typically occurs due to an improper alignment condition, specifically related to the toe setting of the vehicle. When the toe-in is not correctly set and the tires are angled inwards or outwards, it can create uneven wear patterns, leading to one edge of the tread wearing down more than the other, which is noted as feathering.

The choice indicating an incorrect camber setting refers to the angle of the wheels relative to the vertical axis when viewed from the front of the vehicle. While incorrect camber can lead to irregular tire wear, feather-edged wear is more directly associated with issues in toe alignment.

Toe adjustments control the alignment of the tires in relation to the longitudinal centerline of the vehicle, and an incorrect toe setting will predominantly affect tire wear patterns, including feathering. Therefore, selecting the option indicating an incorrect toe-in setting aligns most accurately with the symptom of feather-edged wear, as this condition does not arise from proper toe settings or camber and caster adjustments.