Slowest of slow punctures?

by meach   July 29, 2014  

For around a month now my front tyre has been deflating, but not fast enough to affect my riding in any way. Can do four hour rides with no noticeable change in tyre pressure.
When I go to get my bike out the next day, the rear tyre is still up at 100psi, yet the front is down at 20psi.
Any ideas? On removing the tube I couldn't find any puncture.

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2 quid, fit a new tube, probably the valve passing at high pressure, holds at low pressure.

All Campag

posted by Flying Scot [639 posts]
29th July 2014 - 12:16

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Flying Scot wrote:
2 quid, fit a new tube, probably the valve passing at high pressure, holds at low pressure.

replaced the tube when i took it out to inspect this week, just wanted to know what the issue was and if it was fixable

posted by meach [4 posts]
29th July 2014 - 12:38

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My turbo tyre does that - not sure if there's a turbo specific tube or something? Just took a tube out of a second hand wheel that was deflating in a similar way and the tube said 'turbo' on it too. Weird.

posted by bashthebox [647 posts]
29th July 2014 - 20:48

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meach wrote:
replaced the tube when i took it out to inspect this week, just wanted to know what the issue was and if it was fixable

There's probably a very, very, VERY tiny hole in it.

I fixed a puncture in my wife's rear tyre, checked it, all seemed fine. Still hard after an hour, close to flat after a day. CBA, it's an old, cheap 26" tube so I stuck a spare on instead.

It may be repairable but is it worth the effort? Keep it as a toolbox spare or something.

Simon E's picture

posted by Simon E [2025 posts]
29th July 2014 - 22:54

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Pump it up and stick it in a bath full of water to find where the air is coming from.

posted by andycoventry [120 posts]
30th July 2014 - 8:01

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andycoventry wrote:
Pump it up and stick it in a bath full of water to find where the air is coming from.

I had assumed he had already done this!

All Campag

posted by Flying Scot [639 posts]
30th July 2014 - 8:26

1 Like