I can certainly agree with the “got to get my head around it” statement.As a mechanic trained in the days of foot's and inche's these metric things are just confusing  😮Until you start to grasp the simplicity of the whole system. Air pressure at sea level (14.695 950 254 psi allegedly  8)), volume and distance all come together in the metric system with consumate ease  🙂1 bar equals 1 (standard) atmosphere (well 0.98692316931 if you want to be German about it)  or 100 kilopascals.  ???Therefore 2.5 bar equals 36.259434502 psi. Simple as mate  8)Alternativly you could forget about converting everything to anything and just learn to work with the guage you have  :-[Either that or get a thrupennce haapny worth of alterations dun  ;D

Haha, but the exact temperature helps you know the new record you're setting yourself. I've seen as high as 53 on the BMW and had my previous KTM down to -3.8 I think. BMW has only gone down to about -2.The BMW TPM read out is adjusted against the ambient temperature, so basically it isn't reading out the exact current tyre pressure so there is a degree of inaccuracy actually being built in. If you're pedantic then you'd have to use a gauge. The system will alert you if pressure goes too far out (the GSA is about 24 PSI in the tyre) so otherwise, I use it to see if the tyre is gradually losing pressure... definitely don't use it for an accurate read, but the close-enough is good-enough for me at least...Also remember your pressures should vary according to your load. BMW recommends an increase in pressure if you're carrying a pillion...