Technical data

Effect of wheel size
on suspension-control
systems
Wheel size is very important as a
parameter for the ABS. In partic-
ular, the diameter and the width
of a motorcycle's wheels are pro-
grammed 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
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 ABS system
and consequently cannot be
changed.
If you decide that you would like
to fit non-standard wheels to
your motorcycle, it is very import-
ant to consult a specialist work-
shop beforehand, preferably an
authorised BMW Motorrad deal-
er. In some cases, the data pro-
grammed into the control units
can be changed to suit the new
wheel sizes.
Remove the front wheel
Make sure the ground is level
and firm and place the motor-
cycle on its stand.
with BMW Motorrad ABS
OE
Unclip the retaining clip of the
ABS sensor cable from the
brake line.
Mask off the parts of the wheel
rim that could be scratched in
the process of removing the
brake calipers.
Once the calipers have
been removed, there is
a risk of the brake pads being
pressed together to the extent
that they cannot be slipped back
over the brake disc on reas-
sembly.
Do not operate the handbrake
lever when the brake calipers
have been removed.
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