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Tyre pressures?

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
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jamesgarbett
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Tyre pressures?

Post by jamesgarbett » Thu Oct 05, 2023 12:17 pm

What are you using?

4-cylinder, 19" wheels, stock profiles/widths, non runflats

I feel like the recommended pressures are a little high
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tiglon
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Tyre pressures?

Post by tiglon » Thu Oct 05, 2023 12:40 pm

I'm on 19's non-runflat too, albeit slightly different tyre widths. I go around 34, the BMW stated pressures for runflats seem too high for NRF.

It's been a while since there's been a good argument about RF/NRF tyre pressures :thumbsup:
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flybobbie
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Tyre pressures?

Post by flybobbie » Thu Oct 05, 2023 5:22 pm

Just keep experimenting until you are happy.
So many variations and personal preference, soft or crashy.
I know on 18 inch GYAssy on a 23i the 42psi rear was too hard, also tyre crown worn the most.
But geometry tracking can make a difference.
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N4LLY
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Tyre pressures?

Post by N4LLY » Thu Oct 05, 2023 5:26 pm

34 front and 36 rear. Works for me. That's with both summer and winter air :wink:
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biZ4rreMids
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Tyre pressures?

Post by biZ4rreMids » Thu Oct 05, 2023 8:36 pm

34 front and 36 rear worked best for me too. Started with 40 in the rears originally and it was very crashy.
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Busterboo
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Tyre pressures?

Post by Busterboo » Thu Oct 05, 2023 10:45 pm

My Uncle Eric always used 24 in his cars so I've stuck with that.
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