Ducati SPORT TOURING ST3 Owner's Manual page 46

Warning
Turn the preload adjusting ring nut using a pin
wrench. Proceed with utmost care to avoid hitting the
motorcycles and cut your hand if the wrench pin looses
suddenly its grip while turning.
Important
The shock absorber is filled with gas under
pressure and may cause severe damage if taken apart by
unskilled persons.
E
When carrying a passenger and luggage, set the rear
shock absorber spring to proper preload to improve
motorcycle handling and keep safe clearance from the
ground. You may find that rebound damping needs
adjusting as well.
46