2024 BMW K 1600 B CASUAL LUXURY IN BAGGER STYLE

The wheels are made of alloy—a beautiful Classic forged rims set is available on request—with tubeless tires, in the usual sizes 120/70 ZR 17 on a 3.5 x 17″ rim at the front and 190/55 ZR 17 on a 6 x 17″ rim at the rear.

Thirteen years after it was first marketed, the 1649 cm3 in-line six-cylinder with DOHC 24-valve distribution and bank inclined forward by 55°—like the K1300 four-cylinder—is still a great piece of engineering, which ensures BMW an imperishable place in the Olympus of Gran Tourismo motorcycles alongside the equally sensational boxer of the Honda Gold Wing 1800.

As is well known, this cylinder configuration ensures the almost total absence of vibrations—therefore there is no need to adopt balance shafts—and fantastic smoothness of operation especially at very low revs; however, this is at the price of a rather heavy weight and a considerable width, normally about 20-25% higher than the already important one of a 4 in-line with the same engine capacity.

To contain the transversal dimension, the BMW engineers opted for an engine with a relatively long stroke (67.5 mm) in order to limit the bore (72 mm) and therefore obtain a narrower block. Even more interesting in this regard are the reduction of the distance between the cylinders, limited to only 5 mm against the approximately 10 mm generally in use, and the positioning of the electrical accessories next to the cylinder block and not at the ends of the crankshaft as usual. All these features make it possible to limit the total width of the engine to just 56 cm. For comparison, the 1301 cc in-line 4 of the BMW K1300 measures 50 cm. If we imagine pantographing it up to the 1649 cc of the 6-cylinder, the measurement would rise to 54.1 cm, so we can say that BMW has managed, all other things being equal, to contain the increase in width to a sensational 3.5%. Equally significant is the comparison with the inline 6 of the 1979 Kawasaki Z1300, which despite “only” 1286 cc, is 63.5 cm wide, a good result for the time, but still 27% more than the BMW 4 cylinders of similar volume.

Although limited in the maximum power possible by these choices, the BMW 6-cylinder is still capable of 160 HP, more than abundant for a touring bike which, moreover in this new Euro 5 version, is delivered at just 6,750 rpm against the 7,750 claimed of previous releases. Torque is even more interesting, with a maximum peak of 180 Nm at 5,750 rpm, 5 Nm more than in the Euro 3 and 4 versions. The work done by BMW engineers in adapting this engine to the strictest anti-pollution regulations is truly impressive.