diameter and the width of a
vehicle's wheels are programmed
into the control unit and are
fundamental to all calculations.
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 control
systems.
The sensor rings are essential
for correct wheel-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.
Checking rims
Make sure the ground is level
and firm and place the motor-
cycle on its stand.
Visually inspect the rims for
defects.
Have any damaged rims in-
spected by a specialist work-
shop and replaced if neces-
sary, preferably by an author-
ised BMW Motorrad dealer.
Check the tyre tread
depth
WARNING
Riding with badly worn tyres
Risk of accident due to impaired
handling
If applicable, have the tyres
changed in good time before
they wear to the minimum
tread depth permitted by law.
Make sure the ground is level
and firm and place the motor-
cycle on its stand.
Measure the tyre tread depth
in the main tread grooves with
wear marks.
NOTICE
Wear indicators are built into the
main profile grooves on each
tyre. The tyre is worn out when
the tyre tread has worn down
to the level of the marks. The
locations of the marks are indic-
ated on the edge of the tyre, e.g.
by the letters TI, TWI or by an
arrow.
If the tyre tread is worn to min-
imum:
Replace tyre or tyres, as applic-
able.
9
140
z
Maintenance
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