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Tub Going Flat

 
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iwaters




Joined: 06 Sep 2016
Posts: 186

PostPosted: Mon May 22, 2017 8:51 am    Post subject: Tub Going Flat Reply with quote

I was pre-stretching some tubs ahead of gluing this week. I have two main tubs and then a cheaper spare. I fitted valve extenders to all. Everything was ok except the spare keeps going flat.

It seems to lose quite a lot of pressure quickly (120psi to flat overnight) but I cannot detect where it is coming from. I am guessing it could be the valve extender.

Does anyone use PTFE tape on these? I haven't bothered and the other 2 are fine. is it likely to be leaking inside due to a manufacturing fault?
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Jorgan




Joined: 12 Nov 2007
Posts: 15909
Location: alles was ich bin, alles was ich war

PostPosted: Mon May 22, 2017 9:18 am    Post subject: Reply with quote

Try PTFE tape on it and see. I use a little bit on all my tubs (extenders). The other thing to check, is if the valve core is tight. 120psi to flat overnight is not right, even for latex tubes.
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TriSam




Joined: 26 Aug 2011
Posts: 1162
Location: Tunbridge Wells

PostPosted: Mon May 22, 2017 9:45 am    Post subject: Reply with quote

Tubs and latex tubs apparently lose pressure at a rate of about 1PSI per hour, so 120 to flat is definitely not right I agree.

Is the spare mounted on a rim too? What tub is it?
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TRO Saracen




Joined: 18 Aug 2010
Posts: 902

PostPosted: Mon May 22, 2017 11:57 am    Post subject: Reply with quote

I run Stan's tubeless sealant in mine for puncture protection insurance, but maybe this would fix what seems to be a very slow puncture for yours?
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TRO Saracen




Joined: 18 Aug 2010
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PostPosted: Mon May 22, 2017 11:59 am    Post subject: Reply with quote

Having said that, as a spare is this a problem as you would ever only be inflating it part way through a race/ride?
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iwaters




Joined: 06 Sep 2016
Posts: 186

PostPosted: Mon May 22, 2017 12:36 pm    Post subject: Reply with quote

TriSam wrote:
Tubs and latex tubs apparently lose pressure at a rate of about 1PSI per hour, so 120 to flat is definitely not right I agree.

Is the spare mounted on a rim too? What tub is it?


I mounted it on a rim without glue to pre stretch before I glued up my main tyres. Its a Vittoria Corsa Elite which I got cheap from Merlin.

Its definitely not right. I put the main tyres which are GP 4000s II on and they lost about 15-20 PSI overnight which sounds about normal. The Corsa was flat as a pancake.

Ill redo the valve extension with some PTFE tape and see if that fixes it.

My primary attack if I get a flat will be some Vittoria PitStop and this is just a belt and braces backup, but if it cant hold pressure when left, with 90kg of me pressing on it will be useless.
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JimboP




Joined: 07 Jul 2004
Posts: 3036
Location: SW18

PostPosted: Thu May 25, 2017 12:21 pm    Post subject: Reply with quote

Inflate the spare. Stick it in a bucket of water and see where the bubbles originate from. Will be obvious if it's the valve.
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