BMW S 1000 XR Rider's Manual page 142

Effect of wheel size on
8
chassis and suspension
control systems
140
Wheel size is very important
as a parameter for the frame
and suspension control sys-
tems ASC and DTC. In particu-
lar, the diameter and the width
of a vehicle's wheels are pro-
grammed into the control unit
and are fundamental to all cal-
culations. Any change in these
influencing variables, caused for
z
example by a switch to wheels
other than those installed ex-
works, can have serious effects
on the performance of the con-
trol systems.
The sensor rings are essential
for correct road-speed calcula-
tion, and they too must match
the motorcycle's control sys-
tems and consequently cannot
be changed.
If you decide that you would like
to fit non-standard wheels to
your motorcycle, it is very im-
portant to consult a specialist
workshop beforehand, preferably
an authorised BMW Motorrad
dealer. In these cases, the data
programmed into the control
units has to be changed to suit
the new wheel sizes.
Removing front wheel
Place the motorcycle
on an auxiliary stand;
BMW Motorrad recommends
the BMW Motorrad rear-wheel
stand.
Install the rear-wheel stand
( 130).
OE
with centre stand
Make sure the ground is level
and firm and place the motor-
cycle on its centre stand.
Disengage the cable for the
wheel-speed sensor from re-
taining clips 1 and 2.
Remove screw 3 and remove
the wheel-speed sensor from
its bore.
Mask off the parts of the wheel
rim that could be scratched in
the process of removing the
brake calipers.
Remove securing screws 4
of the left and right brake cal-
lipers.