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How to find an air leak? (When submerging in water doesn’t help)

Posted: Thu Jun 20, 2019 7:10 am
by dorin
Hi there,

I recently switched to Tubolito, super light, generally happy, I had one puncture, can happen.
Now another tube suddenly can’t keep its pressure, it drops to 30psi overnight, I submerged it in water, can’t find any leaks....any hints on what else I should try?

Cheers,
Dorin

Re: How to find an air leak? (When submerging in water doesn’t help)

Posted: Thu Jun 20, 2019 7:23 am
by pdlpsher1
I’ve seen slow leaks that don’t show a stream of bubbles. Instead they create a bubble that sticks to the tube. You need to look for a bubble that’s stuck to the tube’s surface. Eventually that small bubble will grow and get detached from the tube. But it takes a while.


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Re: How to find an air leak? (When submerging in water doesn’t help)

Posted: Thu Jun 20, 2019 7:23 am
by Weenie

Re: How to find an air leak? (When submerging in water doesn’t help)

Posted: Thu Jun 20, 2019 7:34 am
by Klaster_1
I have exactly the same issue! So far my solution was to order a pair of Road S-Tubos :D

Re: How to find an air leak? (When submerging in water doesn’t help)

Posted: Thu Jun 20, 2019 8:48 am
by DanielNorway
Had several with very small leaks around valve core. Tubulito replaced them with no hazzle.

Re: How to find an air leak? (When submerging in water doesn’t help)

Posted: Thu Jun 20, 2019 9:53 am
by alcatraz
I found that if I jammed my tube in a big bucket and put a heavy glass fruit bowl over it I could actually pump it to a high enough pressure where the leak would show itself.

This was with challenger latex tubes where it would hold air at low pressures.

Re: How to find an air leak? (When submerging in water doesn’t help)

Posted: Thu Jun 20, 2019 9:59 am
by Wookski
It’s an inner tube- just throw it in the bin and install another

Re: How to find an air leak? (When submerging in water doesn’t help)

Posted: Thu Jun 20, 2019 11:02 am
by Kumppa
25-30€ innertube...
Did you try max 0,5bar?

Re: How to find an air leak? (When submerging in water doesn’t help)

Posted: Thu Jun 20, 2019 1:39 pm
by PrimO
I had a similar thing with a latex tube a few years ago where it was losing 50/60psi over night but no obvious signs when placed in a bucket so i filled a bath of water and put it in the bath with pump attached and pumped it up and sure enough spotted the tiny hole when pumping but as soon as i stopped pumping the air bubbles would stop.

Re: How to find an air leak? (When submerging in water doesn’t help)

Posted: Thu Jun 20, 2019 4:28 pm
by pdlpsher1
PrimO wrote:
Thu Jun 20, 2019 1:39 pm
I had a similar thing with a latex tube a few years ago where it was losing 50/60psi over night but no obvious signs when placed in a bucket so i filled a bath of water and put it in the bath with pump attached and pumped it up and sure enough spotted the tiny hole when pumping but as soon as i stopped pumping the air bubbles would stop.
This brings back memories of my latex tube days. I never found some of the slow leaks so I gave up and ditched latex for butyl. Just too much frustration and not worth it.

Re: How to find an air leak? (When submerging in water doesn’t help)

Posted: Fri Jun 21, 2019 3:31 pm
by sqber
Have you tried spraying soapy water on the tube? On tubeless setups this is the main way to find leaks.

Re: How to find an air leak? (When submerging in water doesn’t help)

Posted: Fri Jun 21, 2019 3:32 pm
by sqber
Sorry, double post

Re: How to find an air leak? (When submerging in water doesn’t help)

Posted: Fri Jun 21, 2019 4:39 pm
by chupster98
Check your valves - I had the same issue & wrote directly to Tubolito , they sent new inner tubes.

Their response was quick , really impressed!

Image


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Re: How to find an air leak? (When submerging in water doesn’t help)

Posted: Fri Jun 21, 2019 7:35 pm
by akaspin
Just apply blue loctite on presta core threads.

Re: How to find an air leak? (When submerging in water doesn’t help)

Posted: Sat Jun 22, 2019 3:19 pm
by MikeD
Plastic inner tubes have been marketed time and time again. In the end, they all have drawbacks in comparison to butyl tubes. Butyl tubes can be pumped up outside the tire to a large size, which makes it easy to find the leak when dunked under water. Not so with plastic tubes. They can be damaged when pumped up too much. The material can not be stretched as much as butyl rubber before it's permanently damaged.

Re: How to find an air leak? (When submerging in water doesn’t help)

Posted: Sat Jun 22, 2019 3:26 pm
by Klaster_1
PrimO wrote:
Thu Jun 20, 2019 1:39 pm
I had a similar thing with a latex tube a few years ago where it was losing 50/60psi over night but no obvious signs when placed in a bucket so i filled a bath of water and put it in the bath with pump attached and pumped it up and sure enough spotted the tiny hole when pumping but as soon as i stopped pumping the air bubbles would stop.
So I tried that and still found no leaks. This method also requires a second pair of hands. What a pain, maybe I should go back to tubeless, but that's like 100g heavier.

Re: How to find an air leak? (When submerging in water doesn’t help)

Posted: Sat Jun 22, 2019 3:26 pm
by Weenie