Run flats

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
greg1953
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Run flats

Post by greg1953 » Sun Feb 11, 2018 8:34 am

My 62 plate 28i has Bridgestone run flats all round, the front pair are nearly shot, do I have to replace them with run flats or can I mix non run flats ?

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PinkPineapple44
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Run flats

Post by PinkPineapple44 » Sun Feb 11, 2018 9:52 am

I've been running non run flats on the front and run flats on the rear for about 6 months/7000 miles no problem. Rears are finally getting swapped out in a couple of weeks :thumbsup:

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Run flats

Post by HillWalker » Sun Feb 11, 2018 9:55 am

No no no never mix runflats with normal tyres, occasionally some do but it affects the handling and if the worst should happen I'm sure your insurance would take a dim view.

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chrisgreen
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Run flats

Post by chrisgreen » Sun Feb 11, 2018 10:58 am

Handling will be all over the place. Run flats are a very stiff tyre so mixing that with a softer compound non run flat the car will feel out of balance
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Tyreman
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Post by Tyreman » Sun Feb 11, 2018 12:31 pm

Taking them off is fine but you should never mix them :thumbsdown:

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Post by mcbutler » Sun Feb 11, 2018 3:25 pm

greg1953 wrote:
Sun Feb 11, 2018 8:34 am
My 62 plate 28i has Bridgestone run flats all round, the front pair are nearly shot, do I have to replace them with run flats or can I mix non run flats ?
A reputable tyre dealer would refuse to carry out the work unless you are changing all four to non-runflat.

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Run flats

Post by Nick9one1 » Tue Feb 20, 2018 5:56 pm

I ran non runflats on the front and runflats on the rear on my last car for quite a while. It was fine. didn't affect handing.
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Smartbear
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Post by Smartbear » Tue Feb 20, 2018 6:15 pm

Nick9one1 wrote:
Tue Feb 20, 2018 5:56 pm
I ran non runflats on the front and runflats on the rear on my last car for quite a while. It was fine. didn't affect handing.
Same here, I ran rf tyres on the front & normal tyres on the rear for 10k miles and my car felt great :driving:
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Post by GBZ4 » Tue Feb 20, 2018 6:16 pm

This is an extract from National Tyres.

Mixing Conventional Tyres with Run Flat Tyres

As a general rule of thumb, you should avoid mixing different tyre types on a vehicle. This is also true of combining conventional and run flat tyres on a car – as their handling characteristics may differ, they should not be mixed on a vehicle.

Makes sense to me :thumbsup:
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Run flats

Post by Nick9one1 » Tue Feb 20, 2018 6:24 pm

GBZ4 wrote:
Tue Feb 20, 2018 6:16 pm
This is an extract from National Tyres.

Mixing Conventional Tyres with Run Flat Tyres

As a general rule of thumb, you should avoid mixing different tyre types on a vehicle. This is also true of combining conventional and run flat tyres on a car – as their handling characteristics may differ, they should not be mixed on a vehicle.

Makes sense to me :thumbsup:
But also take into account this is written by a company that sells tyres.

Change all four, not two = More profit
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Run flats

Post by Nick9one1 » Tue Feb 20, 2018 6:30 pm

Continentals recommendation:

To me it reads.. not ideal. But you can.

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Post by GBZ4 » Tue Feb 20, 2018 6:31 pm

Nick9one1 wrote:
Tue Feb 20, 2018 6:24 pm
GBZ4 wrote:
Tue Feb 20, 2018 6:16 pm
This is an extract from National Tyres.

Mixing Conventional Tyres with Run Flat Tyres

As a general rule of thumb, you should avoid mixing different tyre types on a vehicle. This is also true of combining conventional and run flat tyres on a car – as their handling characteristics may differ, they should not be mixed on a vehicle.

Makes sense to me :thumbsup:
But also take into account this is written by a company that sells tyres.

Change all four, not two = More profit
This is true but you’d never mix ‘cross-ply and radial’ tyres would you :?
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Run flats

Post by Zoomer » Tue Feb 20, 2018 7:37 pm

Ran standard tyres on the front of my e90 with run flats on the back and although not ideal, It ran fine. Ditched the run flats as soon as they were 2.5 mm. I don't see that they could affect the car too much as essentially they just have a slightly stiffer sidewall. Unless of course you are ragging it around a track etc.
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Run flats

Post by jabber » Tue Feb 20, 2018 7:47 pm

GBZ4 wrote:
Tue Feb 20, 2018 6:31 pm
Nick9one1 wrote:
Tue Feb 20, 2018 6:24 pm
GBZ4 wrote:
Tue Feb 20, 2018 6:16 pm
This is an extract from National Tyres.

Mixing Conventional Tyres with Run Flat Tyres

As a general rule of thumb, you should avoid mixing different tyre types on a vehicle. This is also true of combining conventional and run flat tyres on a car – as their handling characteristics may differ, they should not be mixed on a vehicle.

Makes sense to me :thumbsup:
But also take into account this is written by a company that sells tyres.

Change all four, not two = More profit
This is true but you’d never mix ‘cross-ply and radial’ tyres would you :?
Remember my first car a 1963 ford anglia estate radials on the rear cross-ply on the front and all remoulds !!!
Those were the days. Not
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mr wilks
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Run flats

Post by mr wilks » Tue Feb 20, 2018 8:14 pm

If you drove a modern car all times at the speed limits in the uk i would find it hard to believe that braking , cornering or safety would be hampered running mixed runflat / non runflat paired on different axles .
Yes of course it will always be better to run 4 of the same year , depth , make + model tyres but its far more sketchy running the wrong pressures .
Worn wiper blades through dark winter months is probably more dangerous :cry:
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