I am
42 rear and 36 front.
Too Hard
Good place to start the owners book
sie 1000 / s2r/ s4rs, states
2.1 bar/ 30.5 psi front
2.2 bar/ 32 psi rear
Direct from the Ducati Gurus them selves Shaun and George at Dmoto,
32 psi Front being a Ducati L Twin the weight is more mid mounted, unlike an in line 4 with more weight to the front 34 psi here.
38 /40 psi RearNow all of this is a waste of time unless you use a certified calibrated pressure gauge,not readily available.
I have seen cheap gauges out buy 5 psi
Not a real issue with cars as the tyres have a larger volume.
So don't be cheap on the gauge buy a decent one, or two and compare the results from them.
Imo , at the end of the day if you can keep the Tyres within + or - 2 psi all good