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I think my point is that the wheel because of the fixed spacers should always sit in the middle of the swinging arm (or at least in a designed position relative to the arms on each side). If the SA is shimmed 0.020" either way then front to rear wheel alignment is affected. The steering head and therefore the relative position of the front wheel is fixed to the engine, the rear wheel therefore must move laterally one way or the other depending upon which side you put the additional shim and by, I think, twice the thickness of the shim
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