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

Discuss light weight issues concerning road bikes & parts.
dorin
Posts: 156
Joined: Mon Dec 19, 2016 3:21 pm

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

by Weenie


User avatar
pdlpsher1
Posts: 2424
Joined: Thu Jul 19, 2012 6:09 pm
Location: CO

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.


Sent from my iPhone using Tapatalk

User avatar
Klaster_1
Posts: 775
Joined: Mon Aug 15, 2016 10:25 am
Location: Russia

by Klaster_1

I have exactly the same issue! So far my solution was to order a pair of Road S-Tubos :D

DanielNorway
Posts: 11
Joined: Sun Jul 15, 2018 2:01 pm

by DanielNorway

Had several with very small leaks around valve core. Tubulito replaced them with no hazzle.

alcatraz
Posts: 2204
Joined: Mon Aug 29, 2016 11:19 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.

Wookski
Posts: 1099
Joined: Tue Feb 23, 2016 5:51 am

by Wookski

It’s an inner tube- just throw it in the bin and install another

Kumppa
Posts: 286
Joined: Mon Oct 13, 2014 10:05 am

by Kumppa

25-30€ innertube...
Did you try max 0,5bar?

PrimO
Posts: 108
Joined: Thu Nov 20, 2014 8:49 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.

User avatar
pdlpsher1
Posts: 2424
Joined: Thu Jul 19, 2012 6:09 pm
Location: CO

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.

sqber
Posts: 32
Joined: Sun Dec 21, 2008 12:51 am
Location: Tallinn
Contact:

by sqber

Have you tried spraying soapy water on the tube? On tubeless setups this is the main way to find leaks.

sqber
Posts: 32
Joined: Sun Dec 21, 2008 12:51 am
Location: Tallinn
Contact:

by sqber

Sorry, double post

chupster98
Posts: 12
Joined: Mon Oct 01, 2012 1:22 am

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


Sent from my iPhone using Tapatalk

akaspin
Posts: 68
Joined: Mon Apr 09, 2018 4:36 pm

by akaspin

Just apply blue loctite on presta core threads.

MikeD
Posts: 225
Joined: Thu Dec 11, 2014 9:55 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.

User avatar
Klaster_1
Posts: 775
Joined: Mon Aug 15, 2016 10:25 am
Location: Russia

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.

by Weenie


Post Reply
  • Similar Topics
    Replies
    Views
    Last post