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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > Run flat pucture: is a repair ok ?



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      02-12-2007, 11:10 AM   #1
Snake Pliskin
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Question Run flat pucture: is a repair ok ?

Had my first run flat puncture today.

Large piece of sharp plastic (could see it was it was sticking out by half and inch or so)

Phoned the Dealer and they have said BMW do not suggest repairing puncture on run flats and that you should replace the tyre.

The puncture happened in town today and I went straight round to the local tyre Fit centre and they were able to repair the puncture which was on the flat treaded part of the tyre.

It seams fine and I only travelled about 4 miles with it at 20mph before having it removed.

Does anyone else have experience with this situation ... has anyone had a run flat repaired / or is it a big no no and do I need to get a new one asap.

Appreciate your comments guys.
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      02-12-2007, 11:22 AM   #2
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No experience with this, but you can't compromise safety particularly with tyres. If it were me I would replace the tyre without doubt.
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      02-12-2007, 11:43 AM   #3
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Quote:
Originally Posted by Snake Pliskin View Post
Had my first run flat puncture today.

Large piece of sharp plastic (could see it was it was sticking out by half and inch or so)

Phoned the Dealer and they have said BMW do not suggest repairing puncture on run flats and that you should replace the tyre.

The puncture happened in town today and I went straight round to the local tyre Fit centre and they were able to repair the puncture which was on the flat treaded part of the tyre.

It seams fine and I only travelled about 4 miles with it at 20mph before having it removed.

Does anyone else have experience with this situation ... has anyone had a run flat repaired / or is it a big no no and do I need to get a new one asap.

Appreciate your comments guys.
Bad luck snake ...

From what I have read, plenty of people have had run-flats repaired.

This might help:

http://www.etyres.co.uk/run-flat-tyres

The risk seems to be that damage may occur to the sidewall of the tyre when it is used at zero or reduced pressure. Because the sidewall is reinforced that damage might not be visible.

I suppose you need to decide for yourself if you are concerned about that risk.
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      02-12-2007, 11:44 AM   #4
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      02-12-2007, 11:57 AM   #5
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Quote:
Originally Posted by needforspeed View Post
Bad luck snake ...

From what I have read, plenty of people have had run-flats repaired.

This might help:

http://www.etyres.co.uk/run-flat-tyres

The risk seems to be that damage may occur to the sidewall of the tyre when it is used at zero or reduced pressure. Because the sidewall is reinforced that damage might not be visible.

I suppose you need to decide for yourself if you are concerned about that risk.



Thanks mate

I guess I am "concerned" and thats why I am asking the questions BUT ... as i noticed the problem straight away and got it fixed straight away and it was no where near the side walls I do feel a bit less anxious to rush into buying a new tyre if I don't need to .. its only done 4,000 mile too you see !

The puncture was ditecly on the base of the tyre and the tyre lost very little pressure (if any) so my gut feeling is that the tyre will be ok ... there is just this little nagging doubt at the back of my mind with it being a special tyre ... but i am pretty sure that with it being on the base area and not the side, it should be ok.

The article you attached was interesting but does not give conclusive advise but I am leaning towards thinking it will be ok.

If it was a normal tyre I would say yes no problem ... its only with it being a RF that I am concerned like this.

Still enjoying the car though ... you too ?
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      02-12-2007, 12:44 PM   #6
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I had a puncture in the rear of my Z4 last year and this is how it was explained to me:

In the event of a puncture on an RFT tyre, the steel rim inside the tyre itself will take the load of the car (as intended). The rim only has a finite life in this mode and obviously the higher the speed at which it has to cope, the shorter the lifespan.

In short it's not so much the integrity of the tyre but the RFT component of it that means it should be replaced. After all, you sure can't SEE the state of this!
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      02-12-2007, 12:47 PM   #7
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Bite the bullet and replace it. There is no price tag for peace of mind, at least in my opinion.
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      02-12-2007, 01:48 PM   #8
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There have been a few threads on this subject over the years....

http://www.e90post.com/forums/showpo...5&postcount=12

My comment:

A letter appeared in November BMW Car on the subject of RFT tyre repair.

It would seem that there is a level of ignorance that results in the "can't fix it" response.

The Guy in question went to a national tyre franchise who said no, and two BMW dealers, one who who said it could be repaired and one who said it couldn't. BMW Helpline were also vague on the point.

They then contacted the tyre manufacturer (Goodyear) who confirmed that the tyre could be fixed provided that the puncture was not near the sidewall, and the tyre had not been driven deflated over a long distance.

As an aside BMW claim that a 530d fitted with run-flats is 10seconds faster around the Nurburgring than one without (UK BMW magazine Autmumn/Winter 2005).

My 2p worth:
The only difference that I am aware of between run-flats and a standard tyre is the reinforced sidewall. The wheels themselves are also modified to ensure that a deflated tyre remains on the rim. Therefore they may be treated as any other tyre when considering a repair within the treaded area of the tyre.

However....... whereas you would change a deflated standard tyre immediately and take the tyre for repair this is impossible for the RFT with no spare. Therefore you should carefully consider any damage that may have occured to the tyre whilst running deflated. If you can keep pumping the tyre up and/or run at a slow speed there should be no problem. But if you have driven at high speed and loadings for some distance the heat generated through the extra flexing of the deflated sidewall and loads placed on it are bound to have a detrimental effect on the tyre.

I believe that this is why many tyre fitters will say that you have to replace the tyre. Even in the UK, let alone the litigous USA imagine what would happen should a run-flat fail having been repaired.

At the end of the day tyres are expensive, but you tust them with your life every time that you drive. Just use common sense.
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Last edited by mjh93sa; 02-12-2007 at 03:57 PM.
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      02-12-2007, 01:53 PM   #9
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If the tyre lost no or very little pressure it wouldn't have been utilising its run flat capabilities. Run flats construction are much stronger than conventional tyres.

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      02-12-2007, 03:05 PM   #10
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Quote:
Originally Posted by Snake Pliskin View Post
Thanks mate

I guess I am "concerned" and thats why I am asking the questions BUT ... as i noticed the problem straight away and got it fixed straight away and it was no where near the side walls I do feel a bit less anxious to rush into buying a new tyre if I don't need to .. its only done 4,000 mile too you see !

The puncture was ditecly on the base of the tyre and the tyre lost very little pressure (if any) so my gut feeling is that the tyre will be ok ... there is just this little nagging doubt at the back of my mind with it being a special tyre ... but i am pretty sure that with it being on the base area and not the side, it should be ok.

The article you attached was interesting but does not give conclusive advise but I am leaning towards thinking it will be ok.

If it was a normal tyre I would say yes no problem ... its only with it being a RF that I am concerned like this.

Still enjoying the car though ... you too ?
Put it this way - I've driven a mile or so on an almost totally deflated 'normal' tyre to a tyre repair place, then had it re-fitted after a repair.



If I were in your shoes I'd probably run with the repair as well. What's the worst that could happen? If it blows out and doesn't function perfectly as a runflat it will still function better than a normal tyre.

Also ... I doubt that you are using the full potential of the the tyres ... when was the last time you had it up to 155mph?

Anyway .. so long as you are comfortable with it I think it's just a matter of judgement.

(and yes I'm still loving the car .... everything is good except the mpg!)
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      02-12-2007, 03:50 PM   #11
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Quote:
Originally Posted by needforspeed View Post
Also ... I doubt that you are using the full potential of the the tyres ... when was the last time you had it up to 155mph?
Today, commuting to work!
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      02-12-2007, 03:55 PM   #12
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Originally Posted by beauforty View Post
Today, commuting to work!
I reckon you have your right slipper permanently glued to the accelerator, don't you Paul?!

A case of 'house comfy...car comfy....what's the difference...'!

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      02-12-2007, 06:38 PM   #13
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Originally Posted by beauforty View Post
Today, commuting to work!
Haven't you delimited yet?
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      02-12-2007, 06:40 PM   #14
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Haven't you delimited yet?
That's the next mod....

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      02-13-2007, 03:48 AM   #15
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which type of runflat tires are in bmws? is it the auxilliary type where there is some gadgetry attacheched to the wheel or the type where the side walls are really strong or what? the types are here:
http://en.wikipedia.org/wiki/Run_flat_tire
which do we have?

on a side note... how do you get the car delimited? could it be done as part of a DMS ECU upgrade/remap?
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      02-13-2007, 03:57 AM   #16
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Thanks for the comments.

Everyone I have spoke to all reckons it will be ok.

I suppose I am just paranoid because they are "special" tyres ie RF !

As soon as the tyre picked up the debris I immediately could tell and only drove the car 4 miles at no more than 30 mph to the tyre repair centre and at no time did the tyre look at all flat and no sensors sounded to warn of a flat.

It was well into the treaded area of the tyre and the side walls were totally unaffected.

Maybe it would have been easier if the tyre was a write off as I would have no choice than to get new one then

I guess the overall principle of repairing the puncture on the main tread area is no different to that of a none run flat and I've had plenty of those repaired in the past.
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