Tires; Rims; Wheels - BMW R 18 B 2021 Rider's Manual

If no clear pressure point can be felt:
Have the clutch checked by a specialist
workshop, preferably an authorized
BMW Motorrad retailer.

TIRES

Checking tire pressure
WARNING
Incorrect tire inflation pressure
Poorer handling characteristic of motorcy-
cle, reduction of tire service life
Ensure proper tire inflation pressure.
WARNING
Valve inserts open of their own accord
at high speeds
Sudden loss of tire inflation pressure
Use valve caps with rubber sealing ring
and screw on firmly.
Park motorcycle. Ensure that the ground is
firm and level.
Check tire pressure against data below.
Front tire pressure
42.1 psi (2.9 bar) (with cold tires, one-up
and two-up riding)
Rear tire pressure
46.4 psi (3.2 bar) (with cold tires, one-up
and two-up mode)
If tire pressure is too low:
Correct tire pressure.
Checking tire tread depth
WARNING
Riding with heavily worn tyres
Risk of accident due to poorer rideability
If necessary, replace the tyres before the
legally specified minimum tread depth is
reached.
Park motorcycle. Ensure that the ground is
firm and level.
Measure tire tread depth in main tread
grooves with wear marks.
Tread wear marks are integrated into
the main grooves on every tire. If the
tire tread has worn down to the level of the
marks, the tire is completely worn. The loca-
tions of the marks are indicated on the edge
of the tire, e.g. by the letters TI, TWI or by
an arrow.
When the minimum tread depth is reached:
Replace the worn tire.

RIMS

Checking wheel rims
Park motorcycle. Ensure that the ground is
firm and level.
Visually inspect rims for defects.
Have damaged rims checked and, if nec-
essary, renewed by a specialist workshop,
preferably an authorized BMW Motorrad
retailer.

WHEELS

Effect of wheel sizes on suspension
control systems
The wheel sizes play an important role
with suspension control systems such
as ABS. The diameter and width of the
wheels stored in the control unit have
particular significance as the basis for all
necessary calculations. A change in these
sizes resulting from conversion to wheels
not installed as standard equipment can
seriously affect the control efficiency of
these systems.
The sensor rings required for wheel speed
detection must also match the installed con-
trol systems and may not be replaced.
If you want to convert your motorcycle to
different wheels, please contact a specialist
workshop, preferably a BMW Motorrad re-
tailer. In some cases the data stored in the
control units must be adapted to the new
wheel sizes.
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