Problems with tire wear result from improper caster angles. The vehicle steers toward the side with more caster when the caster angles are not equal.
Tire tread wear with a one-sided shoulder signifies that the inner or outside shoulder rib is much more worn than the other ribs. This type of wear, also known as camber wear, frequently results from excessive positive or negative camber. The caster angle is positive if the steering axis tilts rearward, which means that the upper ball joint or strut mounting point is in front of the lower ball joint. The caster angle is negative if the steering axis tilts forward.
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