Ducati Monster 696 Owner's Manual page 139

MINIMUM TREAD DEPTH
Measure tread depth (S) at the point where tread is
most worn down: it should not be less than 2 mm,
and in any case not less than the legal limit.
Important
Visually inspect the tyres at regular intervals for
cracks and cuts, especially on the side walls, and
bulges or large stains that indicate internal damage
Replace them if badly damaged. Remove any stones
or other foreign bodies caught in the tread.
140
S
Fig. 111