Docnick — "Bars make a lot of sense, but some countries use kilopascals.Bars and kPa are used interchangeably in Europe. 1 bar = 100 kPa. (1 Pascal (Pa) = 1 Newton/meter²)
So the 225 kPa factory recommended air pressure would simply convert to 2.25 bars (or 32.6 psi for the Luddites).