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Other causes include worn outer tie rod ends or inner tie rod sockets on vehicles with rack and pinion steering, or wear between the pinion gear and rack inside the steering housing.
A. A lot! It depends on which chassis part is worn, but some like tie rod ends, control arm bushings and ball joints can and do increase tire wear if the parts are worn and loose. Worn tie rod ends in the steering linkage typically cause the front tires to toe-out. It doesn’t matter if only one tie rod end or both are worn because looseness at either end of the steering linkage will cause both front tires to wear equally. The greater the toe misalignment, the more the tires scrub and wear with every mile driven. The wear is usually greatest on the inside edges of both front tires.