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      11-25-2007, 12:52 PM   #9
GregW / Oregon

Drives: 2015 M4 Coupe, 2012 ML350
Join Date: Nov 2005
Location: Lake Oswego, OR

iTrader: (3)

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M3 folding roof

Originally Posted by swamp2 View Post
I'd place a strong bet on steel. Although I have heard that the new vert will use a few cool "weight savings" (anti-bloating, perhaps stated more accurately) tricks, I'd still bet that the retractable roof is the same material as the 335i vert. Pretty sure that one is steel, right?
Given that the CF roof only saves 11 lb. on the coupe, I would guess an aluminum roof on the cab would save a little less. I doubt BMW would invest in new manufacturing techniques for the limited number of 'verts to be produced. Most of the wieght premium is in the mechanism and motors, but these, too, would be expensive to take weight out of. I think your prediction of using the same roof as the 335i will prove right.

Greg Lake Oswego, Oregon, USA
2015 M4 Coupe - Silverstone/Sakhir/CF
2012 ML350