Mystery puncture -- ideas

[bonker]

Cycled home last night OK. Put bike in corridor ( it usually lives outside). This morning, flat tyre, checked tube and tyre, couldn't find hole in tube, tube stayed up when pumped, no flints in tyre ( Shwalbe Marathon). Put in replacement tube cycled to work with no problem.
What's going on?

 

[BSRU]

Cycled home last night OK. Put bike in corridor ( it usually lives outside). This morning, flat tyre, checked tube and tyre, couldn't find hole in tube, tube stayed up when pumped, no flints in tyre ( Shwalbe Marathon). Put in replacement tube cycled to work with no problem.
What's going on?

Could be a valve problem?, I have had one fail resulting in a slow deflation.

 

[Alun]

Has someone let it down for a "laugh"?

 

[MacB]

Has someone let it down for a "laugh"?

that would be my first guess

 

[Tim Hall]

What kind of valve? I've had presta valves on Specialized tubes leak before now. They've got removable cores, so I removed the core, wrapped a twist of PTFE tape round the thread and screwed in back in tight.

 

[woohoo]

Just had the same on a Conti tube. Dropped from 110 psi to 50. Pumped it up to 120 psi, put the wheel in the bath and couldn't see any bubbles. Removed the tube, redid the water test and still no bubbles. Put it all back and pressure dropped overnight, Put a new new tube in and problem solved. Just one of these things (but probably valve, IMHO).

 

[bonker]

I'll let you know if I get to the bottom of it.

 

[BlackPanther]

Schrader valves are easy to check, that's what spit if for. But any valve leak would show up if you put the tube in water. Methinks that maybe you've got a practical joker nearby,

 

[bonker]

Tube was still up last night and I've made the wife and kids promise that they didn't do it.
As Toyah Wilcox might say itsch a myshtery.

 

[mr_hippo]

Just a wild stab at this - could it be something about temperature differene between outside and inside?