The thing that affect alignment the most are parts-bending and parts-wearing.
Most moving parts are attached with a flexible something. And it sooner or later give way a bit.
Then your car’s frame is a living organism. Don’t think just about the mechanical links, also the frame does bend.
Talking about wheels, it doesn’t take much to go off balance, few millimeters do matter a lot. Tiny otherwise unnoticeable changes can be very noticeable in the alignment department. One degree off for a frame is nothin, for a wheel attached to it, is the difference between aligned and awful asymmetric wear.
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