Ducati superbike 899 panigale Owner's Manual page 238

Minimum tread depth
Measure tread depth (S, Fig 155) 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 tires at regular intervals for
cracks and cuts, especially on sidewalls, bulges or
large spots which are indicative of internal damage.
Replace them if badly damaged. Remove any stones
or other foreign bodies caught in the tread.
238
S
Fig 155