Ducati MONSTER 821, Owner'S Manual, Page: 260 / 295

Tyres
Front tyre pressure:
2.3 bar (33.35 psi) (rider only) - 2.5 bar (36.26 psi) (rider
and passenger).
Rear tyre pressure:
2.5 bar (36.26 psi) (rider only) - 2.8 bar (40.61 psi) (rider
and passenger).
As tyre pressure is affected by ambient temperature
and altitude variations, you are advised to check and
adjust it whenever you are riding in areas where
ample variations in temperature or altitude occur.
Important
Check and set tyre pressure when tyres are
cold. To avoid front wheel rim distortion, when riding
on bumpy roads, increase tyre pressure by 0.2 ÷ 0.3
bar (2.9÷4.35 psi).
TYRE REPAIR OR CHANGE
In the event of a tiny puncture, tubeless tyres will take
a long time to deflate, as they tend to keep air inside.
If you find low pressure on one tyre, check the tyre for
punctures.
Warning
Punctured tyres must be replaced. Replace
tyres with recommended standard tyres only. Be
sure to tighten the valve caps securely to avoid leaks
when riding. Never use tube type tyres. Failure to
heed this warning may lead to sudden tyre bursting
and to serious danger to rider and passenger.
After replacing a tyre, the wheel must be balanced.
Warning
Do not remove or shift the wheel balancing
weights.
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