Steering Axis Inclination (S.A.I.)
Steering axis inclination is angle between a true vertical line starting at center of tire at road contact point and a line drawn through center of upper ball joint (or strut) and lower ball joint. See Fig 1. S.A.I. is built into vehicle and is not an adjustable angle. If S.A.I. is not within specifications, a bent or damaged suspension component may be cause.