Author Topic: Tyre Valve Failures  (Read 2679 times)

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#10

Offline Art

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Re: Tyre Valve Failures
Reply #10 on: 18 September, 2021, 06:35:23 PM
Shed we are talking of the brass assemble where it fits into the rubber sleeve and bung part, not the threaded inner valve core. I've seen old valve stems where the outer rubber part has perished to the extent it breaks off or peels away if you like. It's a clean parting of the two materials at which point the barbs are clearly visible, I wouldn't have thought they'd be bonded too but maybe there are different manufacturing methods some barbed, some bonded.

Sounds as if it's faulty materials or faulty manufacturer.

#11

Offline Shed

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Re: Tyre Valve Failures
Reply #11 on: 18 September, 2021, 07:26:16 PM
*Originally Posted by iNCORRIGIBLE [+]
Hi again, Shed.I am focussing ,presently, on how the brass valve body, complete with its internals is contained within its overall rubber sleeve upon manufacture. It appears it is bonded ,hermetically, and it is at this point where the failures have occurred. I will be approaching the appropriate manufacturers advising them of the obvious concerns.Ed.

So this has happened twice? And it didn't cross your mind to have it checked out/reported the first time?
18 months ago?
Last Edit: 18 September, 2021, 07:34:24 PM by Shed

#12

Offline iNCORRIGIBLE

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Re: Tyre Valve Failures
Reply #12 on: 18 September, 2021, 07:36:25 PM
Hi, Shed. Loose wheel was taken to a qualified motorcycle tyre garage on both occasions but no root cause was arrived at. What would be really useful for all bikers to know is just how often these failures occur? Ed.
Last Edit: 18 September, 2021, 07:39:35 PM by iNCORRIGIBLE
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#13

Offline Shed

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Re: Tyre Valve Failures
Reply #13 on: 18 September, 2021, 07:59:21 PM
*Originally Posted by iNCORRIGIBLE [+]
What would be really useful for all bikers to know is just how often these failures occur? Ed.

I've personally never seen it happen, or even heard of anyone of a friend that this has happened to. Not saying it doesn't, but that's a life-threatening defect is it not?
Was the sealant in when you took it to the tyre shop the first time? I ask as my tyre guy point blank refuses to deal with it. You turn up with that stuff in, and it's new gear all round, or nothing.

So your tyre shop has fitted two valves, and both have failed in exactly the same way. Would you still go there?
Faulty valves? Poor storage? Ancient stock of valves still being used?
Just as well these haven't failed when you've been out riding it!

I feel there is more to this tale than first meets the eye.

Last Edit: 18 September, 2021, 08:12:51 PM by Shed

#14

Offline iNCORRIGIBLE

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Re: Tyre Valve Failures
Reply #14 on: 18 September, 2021, 09:03:50 PM
Agreed. What is really needed is data on how often this happens. Wonder how many will make the effort?  :027:
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#15

Offline jm2

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Re: Tyre Valve Failures
Reply #15 on: 18 September, 2021, 10:31:31 PM
I've never come across this.

I have had a bust bung on a trailer wheel - but suspect that was great age and some misuse of a wheel clamp causing extra stress.

I'd certainly be looking at your pressure checking/filling technique for tool/user problems - but, as said, not known any such failures.
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#16

Offline iNCORRIGIBLE

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Re: Tyre Valve Failures
Reply #16 on: 19 September, 2021, 09:03:45 AM
Thanks for the feedback,jm2.Ed.
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#17

Offline iNCORRIGIBLE

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Re: Tyre Valve Failures
Reply #17 on: 20 September, 2021, 07:42:09 PM
For any of you still interested in my Schrader Tyre Valve failures, please see pics of the ejected valve stems after they left their rubber sleeves.
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#18

Offline FLIZ

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Re: Tyre Valve Failures
Reply #18 on: 20 September, 2021, 09:35:27 PM
 :084: Itís a worrying thought that it could have happened while riding your bike, especially on a   front tyre.

#19

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Re: Tyre Valve Failures
Reply #19 on: 20 September, 2021, 11:04:52 PM
Not something you come across too often and unlike those I've seen before that have had either barbs or ridges on the sides, must be a bonding failure.

 


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