It's what Volvo recommends
See the manual, the tyre pressures are pretty much the same for the same diameter wheel regardless of tyre width.
Tip:
2.7 bar on a 20" wheel makes for a very harsh ride, I tried this year and went back to 2.4bar. It also knocked out my wheel alignment on 2.7bar on UK bumpy roads.
So go around 2.4bar and try it.
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XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.
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