Wheel Alignment Angles: Caster

Fig 1: Identifying Caster Angles

Courtesy of FORD MOTOR CO.

ITEM DESCRIPTION REFERENCE

Item	Description
1	True vertical
2	Positive caster angle
3	Strut centerline
4	Pivot centerline

Caster is the deviation from vertical of an imaginary line drawn through the pivot points (top of strut and lower ball joint), when viewed from the side. The caster specifications Found here will give the vehicle the best directional stability characteristics when loaded and driven. The caster setting is not related to tire wear.