[dradernh]

Originally Posted by aerobod

Here is a method from Bimmerworld to check if you have a problem, besides looking at both the hub chamfer and spacer chamfer for signs of fretting (small movements that will produce abrasion marks):

If this is the problem, the spacers should be replaced with ones that don't have the problematic chamfer and all wheel bolts that have been used with the spacer should be replaced too, due to unknown loading conditions that may have weakened them.

This video by Bimmerworld is a tremendous contribution to the safety of those of us BMW owners who put spacers on our cars.

There are times when seemingly simple modifications are in fact much more complicated that we might realize or imagine.