Ducati SPORT TOURING ST3 Manuel D'utilisation Et Entretien page 168

Chain tensioning
Turn the rear wheel slowly until you find the position
where chain is tightest.
Put motorcycle on the centre stand and push the chain
up pressing with a finger at mid-length of swingarm. The
lower stretch of chain must have a slack (fig. 72) of
30 mm.
Chain tension is adjusted as follows:
Slacken the nut (1, fig. 73) of the wheel shaft, tighten
(turn clockwise) or slacken the screw (2) on either side of
the swingarm equally to increase or reduce chain
tension. If you are slackening the chain, you will have to
push the wheel forward.
Important
Improper chain tension will lead to early wear of
transmission parts.
Make sure you have adjusted to the same setting marks
on both sides of the swingarm.
This will ensure perfect wheel alignment.
Grease the thread of the wheel shaft nut (1) with SHELL
Retinax HDX2 grease and torque nut to 83 Nm.
Grease the threads of adjusting screws (2) with SHELL
Alvania R3 grease and torque them to 8 Nm.
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30 mm
2
E
fig. 72
1
fig. 73
71