Ducati MULTISTRADA Series Owner's Manual page 231

Minimum tread depth
Measure tread depth (S, Fig 233) at the point where
tread is most worn down: it should not be less than 2
mm (0,078 in), and in any case not less than the legal
limit.
Important
Visually inspect the tyres at regular intervals
for detecting cracks and cuts, especially on the side
walls, bulges or large spots that are indicative of
internal damage. Replace them if badly damaged.
Remove any stones or other foreign bodies caught in
the tread.
230
S
Fig 233