Ducati SPORT TOURING ST3 Manuel D'utilisation Et Entretien page 141

Front fork adjusters
The front fork has preload adjuster only.
This adjustment is done using the following outer
adjuster:
1) (fig. 37) to adjust inner springs preload.
To change the preload of the spring inside each fork leg
turn the hex. adjuster (1) with a 22-mm hexagon wrench.
Height A (fig. 37) determines preload and may vary from
E
25 to 10 mm.
Factory setting is 16 mm.
Important
Adjust both fork legs to same settings.
44
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A
1
fig. 37