BMW Motorrad F 850 GS Adventure 2019 Rider's Manual page 233

Chain deflection
40...50 mm (Motorcycle with
no weight applied, supported
on its side stand)
OE
with low-slung
35...45 mm (Motorcycle with
no weight applied, supported
on its side stand)
If measured value is outside per-
mitted tolerance:
Adjusting chain sag (
Adjusting chain sag
Place the motorcycle on its
stand on firm, even ground.
Loosen the axle nut 1.
Use the adjusting screws 3 on
left and right to adjust chain
sag.
231).
Checking chain sag (
Make sure that the scale read-
ings 2 are the same on left and
right.
Tighten quick-release axle
nut 1 to the specified tight-
ening torque.
Rear quick-release axle
in swinging arm
Thread-locking compound:
mechanical
Rear quick-release axle
in swinging arm
100 Nm
230).
Check that the washer 4 is
lying flat against the screw
head 3, correct as necessary.
Checking chain wear
Requirement
Chain tension is set correctly.
10
231
z