Steering Axis Inclination (S.A.I.)
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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.