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Inner tube prolapse

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Keithy
Nova Slayer



Joined: 22 Sep 2020
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PostPosted: 15:42 - 08 Nov 2020    Post subject: Inner tube prolapse Reply with quote
Fixing one of SWMBO’s grandkids bikes which lost 7.5 psi in about 4 hours. Can’t see any obvious leaks but the inner tube looks, well, not good. Is this possibly the cause of the loss of air, has it ‘gone slack’?
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Ste
Not Work Safe



Joined: 01 Sep 2002
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PostPosted: 15:49 - 08 Nov 2020    Post subject: Reply with quote
Keithy wrote:
the inner tube looks, well, not good

Inner tubes inflating unevenly when not in a tyre isn't a problem and it's not the cause of pressure being lost.
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Keithy
Nova Slayer



Joined: 22 Sep 2020
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PostPosted: 16:06 - 08 Nov 2020    Post subject: Reply with quote
Oh. Can’t find an air leak on either repair patch or the valve. Odd.
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Easy-X
World Chat Champion



Joined: 08 Mar 2019
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PostPosted: 16:40 - 08 Nov 2020    Post subject: Reply with quote
It doesn't bode well though, in that state. What size? You can nip down to Poundland for anything 20 to 26" if it's just a kids' bike.
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Keithy
Nova Slayer



Joined: 22 Sep 2020
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PostPosted: 17:30 - 08 Nov 2020    Post subject: Reply with quote
Just got one from Halfrauds, £4.

May re-use the old as a helmet rest or a pile cushion, although I suspect the valve may compromise its suitability for either.
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thx1138
World Chat Champion



Joined: 06 Oct 2005
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PostPosted: 01:27 - 09 Nov 2020    Post subject: Re: Inner tube prolapse Reply with quote
Keithy wrote:
Fixing one of SWMBO’s grandkids bikes which lost 7.5 psi in about 4 hours. Can’t see any obvious leaks but the inner tube looks, well, not good. Is this possibly the cause of the loss of air, has it ‘gone slack’?


dodgy valve
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bugeye_bob
World Chat Champion



Joined: 05 Sep 2013
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PostPosted: 01:43 - 09 Nov 2020    Post subject: Re: Inner tube prolapse Reply with quote
thx1138 wrote:
Keithy wrote:
Fixing one of SWMBO’s grandkids bikes which lost 7.5 psi in about 4 hours. Can’t see any obvious leaks but the inner tube looks, well, not good. Is this possibly the cause of the loss of air, has it ‘gone slack’?


dodgy valve


I got a brand new bike that did it, replaced inner tubes, still looses air lol
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RhynoCZ
Super Spammer



Joined: 09 Mar 2012
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PostPosted: 22:59 - 13 Nov 2020    Post subject: Re: Inner tube prolapse Reply with quote
bugeye_bob wrote:
I got a brand new bike that did it, replaced inner tubes, still looses air lol


How quickly do they loose air? Tubes do loose air over time and it's perfectly normal. They are not perfectly air tight, air seeps through the rubber and the valve o-ring (seal). However you shouldn't find your bike with completely flat tyres after just a few hours after inflation. Thumbs Up

By the way, higher the air pressure you run, quicker this air leakage occurs. Road bikes lose air quicker than MTBs, for instance. I run 6 BAR front and 6.5 BAR back on my road bike and this drops to about 5 BAR in about a week.
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