BMW F 800 GS Rider's Manual page 114

Effect of wheel size on
9
chassis and suspension
control systems
112
Wheel size is very important as
a parameter for the running-gear
control systems ABS and ASC.
In particular, the diameter and the
width of a vehicle's wheels are
programmed into the control unit
and are fundamental to all cal-
culations. Any change in these
influencing variables, caused for
example by a switch to wheels
z
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 some cases, the data
programmed into the control
units can be changed to suit the
new wheel sizes.
Removing front wheel
Make sure the ground is level
and firm and place the motor-
cycle on its stand.
Remove screw 1 and remove
the ABS sensor from its bore.
Remove screws 2 from the
right brake caliper.
Force the brake pads 3 slightly
apart by rocking brake caliper 4
back and forth against brake
disc 5.