Ok so are the wheels posted OEM BMW wheels or aftermarket? I'm thinking heavy impact. Hard to think wheels just explode like that without some sort of heavy impact or loading.
Years ago a buddy of mine had a '76 Trans Am, crashed it hard as he came over a dirt hill and hit another car. Everyone survived but his TA was destroyed. The front right wheel, I think it was, broke just the same way, but of a heavy impact so I don't know but can crap aftermarket wheels just break like this?