Ducati SUPERBIKE 848 Owner's Manual page 19

Trip meter "TRIP A"
While in this function, if you press switch (1, fig. 8) in
E
position B "▼" for 3 seconds, the reading is reset.
If the reading exceeds 999.9, it is reset to zero and the
count restarts automatically.
If the units of measurement set by the dealer are changed,
the distance travelled is reset to zero and the count is
restarted in the new units.
18
vs. EU
vs. UK
v.s. USA
fig. 10