[clone1008]

I reached out to Micheline online to ask about tire pressures on a new staggered setup of PS4S
I currently have a 2020 BMW 330i with a square setup running 225/40R19 Turanza LS100 A RFT. iDrive recommends pressure at 39 front and 42 rear.

My staggered setup will be 245/35R20 Front and 285/30R20 rear.

Here is their response...
"We show based on the OE tire size of 225/40ZR19Rf and OE pressures of 39 psi front and 42 rear, the new pressures for the front tires will carry a similar load at 35 psi front and 26 psi rear! However, we are only allowed to recommend the OE pressures, even though, you replaced your tires with a staggered fitment. Using the lower pressures could cause the TPMS light to come on and you may need to have it recalibrated!"

Consumer Care Senior Rep
Executive Response Team

Does this sound right? Why so low on the rears? Also what is involved with re-calibrating the TPMS?