Ducati 998S Owner's Manual page 53

Tyre repair or replacement (tubeless tyres)
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 with recommended standard tyres only.
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.
After replacing a tyre, the wheel must 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.
Minimum tread depth
Measure tread depth (S, fig. 40) at the point where tread
is most worn down. It should not be less than 2 mm and
anyway not below 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.
E
fig. 40
53