| Fig. 1: Caster angle computation
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| Fig. 2: Caster angle affects straight line stability
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Caster is the forward or rearward tilt of the upper ball joint. Rearward tilt is positive caster; forward tilt is negative caster. Caster is adjusted by changing the shims between the upper arm shaft and the frame, or, by turning the shaft until the correct angle is obtained.
