Quote:
Originally Posted by Zatellia
So mine came from the dealer at 35 front and back, the BMW app "recommended 33.9 front and back. How does the app calculate its recommended psi, does it use avg speed + tire size? Curious if anyone knows
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The app picks up from the tire choice you make in iDrive.
If they’re cold, the app will recommend 32 psi, if you choose 19” summer tires for less than 160 km/h.
When you drive, tires get warmer, the app adjusts for the temperature.
Best is to set the baseline after not driving the car to ensure tires are as cold as possible. Then the recommended psi will always match what the tires have (32 cold, 35 hot, for example). Don’t try to set the pressure based on hot tires because the app is not updated real time, and because tires raise temperature differently and individually, so when driven, the car will ask (and report) different tire pressures per tire (e.g. 34 front left, 33 front right).