BMW Motorrad R 1250 R, Rider'S Manual

Page: 172 / 300

166 ENGINEERING DETAILS
GEAR SHIFT ASSISTANT
with shift assistant Pro
OE
Shift assistant Pro
Your vehicle is equipped with
a Pro shift assistant, a system
originally developed for racing
and now adapted for touring.
It permits upshifts and down-
shifts without declutching or
closing the throttle in virtually
all load and rpm ranges.
Advantages
70-80 % of all gearshifts on
a trip can be done without
using the clutch.
Less relative movement
between rider and passenger
because the shift pauses are
shorter.
It is not necessary to close the
throttle valve when shifting
under acceleration.
When braking and downshift-
ing (throttle valve closed),
engine speed is adjusted by
blipping the throttle.
Shift time is shorter than a
gearshift with clutch actu-
ation.
In order for the system to
identify a gearshift request, the
rider has to move the gearshift
lever from its idle position in
the desired direction against
the spring force through a
certain "overtravel" at ordinary
speed or rapidly and keep
the gearshift lever in this
position until the gearshift is
completed. It is not necessary
to increase the force applied to
the shift lever while shifting is
in progress. Once the gearshift
has completed the shift lever
has to be fully released before
another gearshift with the Pro
shift assistant can take place.
When shifting gears with the
Pro shift assistant, the rider
has to keep load state (throttle
grip position) constant before
and during the gearshift. A
change in the position of the
throttle grip during a gearshift
can cause the function to abort
and/or lead to a missed shift.
The Pro shift assistant provides
no assistance for the gearshift
if the rider declutches.