From what I recall driving on belted and bias tires, when radials were swapped on a toe adjustment was needed to correct drifting off of the road crown. Being pretty young and not inclined to spend good money for alignments for junkyard tires, I learned a lot of wear patterns. I've since forgotten most of them as I am far less tolerant of wandering, drifting, shuddering cars and tires cost a lot more new.