[themur]

My M340i came with Eagle RFs and as specified in the manual for tire specs 225/40 R19 front and 255/35 R19 rear it was 38 psi all around. I switched to PS4S but iDrive now seems to say they should be at 37 psi all around. Wouldn't my PSI have remained the same for the same speced tire setup?

[siegester]

Idrive has an auto detect for the tires. For me it was wrong. Once manually selected the tire type idrive showed the correct pressure. Maybe try manually setting yours and see if it goes back to 38psi

[themur]

Originally Posted by cjof2003

Idrive has an auto detect for the tires. For me it was wrong. Once manually selected the tire type idrive showed the correct pressure. Maybe try manually setting yours and see if it goes back to 38psi

So I've actually been the other way around for me. I tried putting the swapped tires back on auto and it'll say 38 psi but eventually iDrive will say tires can no longer be detected so I switched to manual and selected the right specs but for whatever reason a cold PSI of 37 is recommended all around. Thankfully it's only 1 psi different but I found it to be odd.