Ducati Streetfighter Owner's Manual page 69

Once preload has been set as required, tighten the upper ring
nut.
Warning
Use a specific pin wrench to turn the preload adjusting
nut. Be careful when turning the nut with the wrench, as the
pin may slip out of the ring nut recess and you may hurt your
hand hitting motorcycle parts.
Warning
E
The shock absorber is filled with gas under pressure
and may cause severe damage if taken apart by unskilled
persons.
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.
68