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Tyre Pressures

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
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cerbera
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Tyre Pressures

Post by cerbera » Sat Nov 14, 2015 7:01 pm

When I bought my car it was wearing non standard alloys with non run flat tyres.
The the fronts are 235/35R19 and rears are 265/30R19 .

According to the tyre pressure label, the factory standard 19's (225/35 Front, 255/30 Rear) should be 2.3 bar and 2.8 bar respectively.
Am I safe to use these RFT pressures on none runflats.

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Nictrix
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Re: Tyre Pressures

Post by Nictrix » Sat Nov 14, 2015 7:23 pm

We have different sizes to you (18s) but have just stuck to the standard pressures and the car feels fine and not had any problems
E89 2014 35i M Sport Black with Black leather :)

paulgs1000
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Re: Tyre Pressures

Post by paulgs1000 » Sat Nov 14, 2015 7:38 pm

Cerbera, I'm no tyre specialist but I think RFT use higher pressures than non RFT.

I do not run my 3.0si at RFT pressures - 32ftlbs front and 34 ftlbs rear is what I use with my GoodYear F1s (non RFT 18in).
Now Porsche flat 6 experience, 986S & 981S.
2006 Z4MR Imola Red/Imola Red, 2008 3.0si Sport Stratus Grey/Piano black, 2006 2.0I Sport Silver Grey Facelift. MX5, TVR Chimaera, many motorbikes.

Z4_35i
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Re: Tyre Pressures

Post by Z4_35i » Sat Nov 14, 2015 10:26 pm

We're running Michelin Pilot SS, set at the same PSI as the RFTs, no issues with uneven wear, 3+ years.

Front Michelin Pilot Super Sports 235/35R19 91Y
Rear Michelin Pilot Super Sports 265/30R19 93Y

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cerbera
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Re: Tyre Pressures

Post by cerbera » Sat Nov 14, 2015 10:36 pm

Cheers chaps :D

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