Check for wear on the outboard side of the "wishbone". (rearward control arm). That's the usual suspect that wears out and causes tire wear and partly why you'll see more than usual negative camber (not the cause of tire wear).

It's difficult to see the motion of the ball joint when loaded so if you have air springs best to remove the pressure and it will become obvious. But even with spring pressure you can pry with a crowbar and if you see motion it's shot.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)