Wheel Alignment Angles: Caster

Fig 1: Positive Caster, True Vertical & Steering Axis

Courtesy of FORD MOTOR CO.

Item	Part Number	Description
1	-	Positive caster
2	-	True vertical
3	-	Steering axis

Caster is the deviation from vertical of an imaginary line drawn through the ball joints when viewed from the side. The caster specifications in this article will give the vehicle the best directional stability characteristics when loaded and driven. The caster setting is not related to tire wear.