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      06-11-2019, 09:42 PM   #8
CeEl
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Drives: 2020 Z4 M40i
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Quote:
Originally Posted by Jim S View Post
Yes, I have noticed this a well. I think the recommended tyre pressures are adjusted relative to the ambient temperature. The hotter the tyres are the higher the recommended pressure.

34 psi seems to be the normal recommended pressure front and rear at base ambient temperature. I am guessing that will be about 70F. I am also guessing that at 80F it will be 35psi and at 90F 36psi and so forth.

Just my thoughts. Not sure though.
Thanks... so the door sticker says 32 psi. That would be at about 50F temp. Is it supposed to be 30 psi at 30F? Surely 32 if the minimum psi?

The manual does a very poor job explaining this. And I am a bit skeptical. I never heard about increasing tire pressure to account for higher temps. Except for tracking.
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