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Tyre pressures on 19"

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
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MrBrucelee1972
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Tyre pressures on 19"

Post by MrBrucelee1972 » Sun Mar 26, 2017 8:27 am

Hi all, hear alot about the alloys cracking! Im on bridgestone potenza. I think runflats. Whats best pressures to run to avoid this cracking?
Cheers all :thumbsup:

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Nictrix
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Tyre pressures on 19"

Post by Nictrix » Sun Mar 26, 2017 8:33 am

You are about to open up a can of worms.
I doubt you will get a proper answer to this question.
The only thing I would say to avoid cracking 19s with runflats is avoid potholes.
Same could probably be said for 19s with non runflats too though.
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MrBrucelee1972
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Tyre pressures on 19"

Post by MrBrucelee1972 » Sun Mar 26, 2017 9:04 am

:? Sorry no worms please! :rofl:

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jimbo1958
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Tyre pressures on 19"

Post by jimbo1958 » Sun Mar 26, 2017 9:11 am

Nictrix wrote:You are about to open up a can of worms.
I doubt you will get a proper answer to this question.
The only thing I would say to avoid cracking 19s with runflats is avoid potholes.
Same could probably be said for 19s with non runflats too though.
Agreed.
Replaced my 19" RFT's to MPSS within a week of ownership and touch wood, no cracks even after hitting a few potholes over the years. :thumbsup:
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MrBrucelee1972
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Tyre pressures on 19"

Post by MrBrucelee1972 » Sun Mar 26, 2017 10:28 am

MPSS??? :?

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Nictrix
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Tyre pressures on 19"

Post by Nictrix » Sun Mar 26, 2017 10:47 am

MrBrucelee1972 wrote:MPSS??? :?
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Tyre pressures on 19"

Post by Busterboo » Sun Mar 26, 2017 11:15 am

MrBrucelee1972 wrote:Hi all, hear alot about the alloys cracking! Im on bridgestone potenza. I think runflats. Whats best pressures to run to avoid this cracking?
Cheers all :thumbsup:
By all accounts, your chances of cracked wheels seem quite high.

Have you checked to see if they're cracked already?
Vidi, vici, veni

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benv6
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Tyre pressures on 19"

Post by benv6 » Sun Mar 26, 2017 11:30 am

Go non-RFT as soon as you can, you will get a much better handling too :wink:
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Tyre pressures on 19"

Post by Silverzedtom » Sun Mar 26, 2017 12:24 pm

Go to a track with the intention of wearing them down on silky smooth tarmac where they won't be taking hits.

Get some decent non rft's on, by this time you've got the track bug and will want to return. You will see on track how much better the cars handling and it will all be justified! :driving: :thumbsup:
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Busterboo
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Tyre pressures on 19"

Post by Busterboo » Mon Mar 27, 2017 6:57 am

MrBrucelee1972 wrote:Hi all, hear alot about the alloys cracking! Im on bridgestone potenza. I think runflats. Whats best pressures to run to avoid this cracking?
Cheers all :thumbsup:
The 'theory' is that low-profile runflats + potholes cause BMW OE 19" alloys to crack.

Some argue that, because runflats give a hard ride, owners under-inflate them and it's this that contributes to the problem.

The cure-all, but ridiculously expensive solution, is obvious, of course. Don't use OE 19" wheels. However, to 'abandon your runflats' seems a viable compromise, doesn't it? They are, after all, crap tyres.
Vidi, vici, veni

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