Ducati SuperBike 1098S Use And Maintenance Manual page 90

Minimum tread depth
Measure the tread depth (S, fig. 79) at the point where the
tread is most worn.
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
E
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 stuck in the
tread.
90
S
fig. 79