[U235]

2023 LCI with the factory 21" All-Seasons. We're at 7,500 miles so I rotated the tires this weekend. After rotating, the infotainment prompted me that it needed to reset the calibration, to which it did. While there, I noticed an area to select the tire size and type, and I put in the correct specs from the drop downs (pictured below). I was surprised to see the recommended pressure was so high, much higher than the door jamb sticker (which also shows the proper 21" tire size). Understanding that the door jamb is cold pressure, but still, it is a huge difference.

I ignored it, but today while driving, I got an alert to check my tire pressure, clearly the infotainment thinks my pressure is low. It may be 1-2 PSI low, but now I'm clueless as to what pressure to set these tires. 51 PSI (even warm) seems crazy, the tire says max 50 PSI.

I did notice as I drove more and the temperatures increased, the recommended tire pressure increased, so my guess is BMW is trying to adjust the tire pressure based on the ambient conditions and tire temperature. This is kind of cool, but it doesn't show where you can indicate that you've got Nitrogen in the tires which reacts differently to temperature changes.

Anyways, what do you suggest I should run for cold pressure, the car seems to still want 48-49 PSI in the rears cold, but the door sticker indicates 41. We drove almost 3000 miles around New Year to Colorado, and I had them at the 35/41 suggested by the door sticker.

Pics below of the conflicting info:

[Orient330iNYC]

it looks like idrive is giving you the full load >100mph pressures adjusted for temp. i tend to set cold temp based on something between the two pressures and ignore idrive.
door jamb looks to be the <100mph pressures
from the manual:

[U235]

Originally Posted by Orient330iNYC

it looks like idrive is giving you the full load >100mph pressures adjusted for temp. i tend to set cold temp based on something between the two pressures and ignore idrive.
door jamb looks to be the <100mph pressures
from the manual:

Ahh, I assumed the < and > 100 mph was more a tire rating thing. As these tires are H-rated, they're good for >100 mph. As I don't drive over 100 mph, I'll readjust to < 100 mph and see where it goes.

[Orient330iNYC]

Originally Posted by U235

Ahh, I assumed the < and > 100 mph was more a tire rating thing. As these tires are H-rated, they're good for >100 mph. As I don't drive over 100 mph, I'll readjust to < 100 mph and see where it goes.

you might need to experiment a little. in my experience, the lower pressure can lead to shoulder wear due to the stiff sidewalls of the runflat. i typically will do <100 mph psi plus 2-3 psi.

i suspect your ride will be a bit cushier now

[U235]

Originally Posted by Orient330iNYC

you might need to experiment a little. in my experience, the lower pressure can lead to shoulder wear due to the stiff sidewalls of the runflat. i typically will do <100 mph psi plus 2-3 psi.

i suspect your ride will be a bit cushier now

That's what I usually do, recommendation +2 psi. I just did 38/43, but granted the tires aren't completely cold.