First I must say, you have a very nice car. It's very simple why your rims bent. You have a 50k plus car with $2000 wheels on it. You get what you pay for. Why don't you drop the money for some high quality multi-piece wheels. You went for the best car (540i), the best tuning (dinan), but then you went el cheapo for the wheels. I don't mean any harm by this, I love your cars. I think you should invest in some better quality wheels. Breyton is one of the lowest rated German wheel manufactors. Try names like Hartge, Alpinia, etc..