After presenting the R 1250 GS Ultimate, the last adventure before the arrival of the new generation with 1300 engine, BMW has filed a patent application for a lightened frame through a unprecedented connection with the engine. In detail, the new unit is equipped with a half frame that is fixed directly to the engine via large bolts that also link the cylinder head to the block, so as to create a lighter and more compact design than a conventional frame.
Instead of being surrounded by a steel or aluminum structure that connects the steering head to the swingarm pivot, the engine is connected by an alloy front frame attached directly to the engine.
This solution provides a direct coupling to the steering head, with the engine also serving as the main chassis. The Ducati Panigale models with V4 engines adopt a similar solution, with the engine also acting as a stressed element helping to create the main backbone of the bike.
The patent images show how the cylinders and the half frame form a straight line to take the strain from one end of the bike to the other, reducing the number of parts and the weight of the bike. The patent also has the purpose of reducing the width of the bike, a fly in the ointment of all models with a transverse engine. According to the shape of the frame, this seems to be able to accommodate a three-cylinder engine, even more compact than a four.