Ducati MONSTER Owner's Manual page 52

Tyre repair or replacement
In the event of a tiny puncture, tubeless tyres will take a
long time to deflate, as they tend to keep air inside. If
you find low pressure on one tyre, check the tyre for
punctures.
Warning
A tyre must be replaced when punctured. Replace
tyres using recommended standard tyres only.
E Be sure to tighten the valve caps securely to avoid leaks
when riding. Never use tube type tyres. Failure to heed
this warning may lead to sudden tyre bursting and to
serious danger to rider and passenger.
After replacing a tyre, the wheel should be balanced.
Important
Do not remove or shift the wheel balancing
weights.
Note
If tyres need replacing, contact a Ducati Dealer or
authorized workshop to make sure wheels are removed
and refitted correctly.
52
Minimum tread depth
Measure tread depth (S, fig. 39) at the point where tread
is most worn down. It should not be less than 2
mm/0.078 in. and anyway not below the legal limit.
Important
Visually inspect the tyres at regular intervals for
detecting cracks or cuts, on the side walls especially,
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.
fig. 39