Quote:
Originally Posted by nybimmerfan
Having carbon fiber roof will result in the elimination of the sunroof/moonroof as having it will structurally weaken the roof. Remember, carbon fiber is made of of several layers of almost paper-thin carbon fiber sheets glued together. The current 2012/2013 M5 roof with the sunroof/moonroof is made of aluminum.
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While I agree with what you've said, the roof has very, very, very little structural importance. The weight of the car in a roll over is held by the A-pillar entirely. The roof is just a thin layer of steel, aluminum, or carbon fiber to cover the passenger cell.
Typically, a roof + sunroof weighs about 50lbs, a roof alone is about 30lbs, and a carbon roof is under 15lbs.