The M Carbon roof option replaces the big glass panel and brings the M850i that much closer to an M8 Gran Coupe.
The BMW 8 Series Gran Coupe may be a lot of things – stylish, luxurious, even fast – but one thing it's not is light of weight. Even in base 840i spec, the thing weighs a portly 4,262 pounds, or as much as 4,758 lbs in top M850i xDrive form. That's more than twice the weight of a Mazda MX-5 Miata. But there are things you can do to make it lighter.
In a series of updates announced across its lineup for the fall, BMW has introduced the option of a carbon-fiber roof panel on the M850i xDrive Gran Coupe.
We don't know how much the M Carbon roof weighs, or more to the point, how much less it weighs than the standard glass roof panel. But you can bet that it represents a substantial weight savings – and right where it counts. Fitting the carbon roof panel, as BMW has on an array of its M-fettled coupes in the past, reduces mass at the top of the vehicle, farthest away from the wheels, where it's most likely to affect the vehicle's roll in the corners, as well as its pitch and dive under acceleration and braking.
The roof panel is one of a series of carbon-fiber components available for the 8 Series Gran Coupe. The M Performance Parts catalog for the sleek four-door also includes mirror housings, front and side grilles, and an array of interior trim pieces, all crafted from the lightweight woven material.
At present the M850i xDrive is the top version of the Gran Coupe on offer, but you can bet there'll be an M8 Gran Coupe soon to follow with the more potent powertrain (and other upgrades) already featured in the M8 coupe and convertible. And when it does, you can rest assured that it'll include even more carbon-fiber pieces – from the roof on down.