Ducati ST4S ABS Owner's Manual page 35

STANDARD factory setting is as follows:
compression: 12 clicks;
rebound: 11 clicks.
The setting range is 14 clicks (both for rebound and
compression). The 14th click gives the softest damping.
To change the preload of the spring inside each fork leg
turn the hex. adjusting nut (2) with a 22-mm hexagon
wrench.
Height A (fig. 29) determines preload and may vary from
25 to 10 mm.
Factory setting is 16 mm.
Important
Adjust both fork legs to same settings.
E
3
fig. 30
35