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Different cold PSI does not directly translate to different tire diameters when running (different weights front/back, tires can heat differently, etc.).
I would just go with what the door sticker says personally. I don't think BMW engineers would give different PSI front/back if it would cause transfer case failure.
Last edited by 4llr; 11-06-2016 at 08:45 AM..
Reason: Add clarification
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