BMW K 1300 GT - Manual (Page 14)

BMW
Media
Information
10/2008
Page 14
and easily and where individual gears with different ratios may also be
interchanged as required. In series production, on the other hand, this concept
provides the option to pre-assemble the entire gearbox as one unit, offering
advantages in the assembly process.
The dog-shift two-shaft gearbox is slender in design and extra-light. The
gears are shifted by a shift cylinder, shift forks and sliding wheels to create
a positive engagement.
The gearbox has been upgraded and mod fi ed for the new K 1300 S, with
the shift forks, the shape of the dog-shift units and the geometry of the gears
themselves being optimised in the process. The gears are now contoured
differently at the rear and the shift forks come with a three-point rest replacing
the former two-point base.
To reduce weight the hollow shift cylinder is made of high-strength aluminium
alloy and runs in anti-friction bearings. The shift forks are made of steel and
are lubricated by compressed oil. To reduce the length of the gearbox, the two
gearbox shafts are positioned above one another. The gears themselves are
in straight-tooth confi guration benefi ting not only the degree of effi ciency but
also the overall width of the gearbox.
The K 1300 S features a new shift lever with an ergonomically optimised
pivot point. Together with the likewise new anti-friction bearing for the
shift lever this ensures an even more precise and faster gearshift than before.
At the same time gearshift travel is even shorter and more dynamic.
For the fi rst time in the history of large-scale motorcycle production by
BMW and, indeed, for the fi rst time in series production worldwide, the rider
of the K 1300 S is able to shift up with the help of the optional HP Gearshift
Assistant without operating the clutch and, accordingly, without the slightest
interruption of traction and pulling force. To perform this operation the ignition
and fuel supply are interrupted for fractions of a second in the shift process.
The HP Gearshift Assistant introduced for the fi rst time on the HP2 Sport
comes together with the sports footrests available as special equipment.
Shaft drive to the rear wheel – optimised and quite unique in the
sports segment.
As on all large-capacity BMW motorcycles, the rear wheel is driven by
a drive shaft also on the K 1300 S. And since the engine is fi tted crosswise,
the shaft comes on two pivots.