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Not sure how old yours are, but the diamond cut alloys on my 3 year old 3 series are wrecked now due to this. Passed that car onto the wife so I'm loathed to buy a new set for her as she will probably kerb them at some point, but boy they sure do let that awesome looking car down.These are stone chips on my rear passenger side one, the other side has no chips at all, they already have started to grow in size as water ingress takes place ..