stand back and look at it with the bears set straight, if nothing if visible start measuring, from frame to front/rear and top of tire, and from tire to tire edges, etc. compare those measurements to the side not wearing,
measurements should show if camber (lean in/out) or toe in/out, is out of whack.
the ball joints are not adjustable, so only a bent spindle can cause camber
toe in/out is adjustable with the tie rods.