Quote:
Originally Posted by stressdoc
I don't think it's the vertical loading (weight) that is the problem. When you crank a rack down it can exert a lot of compression across the roof -- I notice that sometimes the sunroof will not close on my E90 when I have a rack on tight. That could begin to fatigue the carbon fibre structure or perhaps even cause micro fractures on the surface resin. This could be fixed by having a rack with a cross bar attachment that could float (move) relative to the base support.
Better yet, replace carbon fibre with a proper ceramic!
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On the E92 the CF roof does not bear weight or stress from the stock roof bar mounting points as those are borne by the steel structure underneath. The F82 looks no different in construction. We really need an answer on this from BMW.