[quiff]

Went to inflate tyres at the weekend. Front tyre wouldn’t inflate.

Removed dust cap. Unscrewed top nut of presta valve. Depressed top of valve to release a bit of what little air was in there. Clamped pump head in place. Pumped – only to meet a lot of resistance. Removed pump head, depressed valve, tried again – same resistance. Unscrewed and removed the valve core, put it back in, tried again. Still won’t accept air. Pump is working fine on other tyres / tubes.

I have had this occasionally in the past, but usually some form of the above resolves it. Any suggestions?

Topic

[quiff]

Replaced problematic valve core with one from a punctured tube – now working fine.

The bizarre bit though – I put the problematic valve core in the punctured tube as a test, and it inflated fine (well, apart from the puncture). Put it back on the tube it belongs to though, and the resistance is back. Put it back on the punctured tube, fine. *shrugs*

[quiff]

No, it’s a valve on an inner tube. If I remove the valve core, I can get air into the tube through the valve stem – but obviously can’t keep it there / at decent pressure while I refit the core. And if I clamp the valve core in the pump head (while it’s not connected to the tube) air seems to be flowing through the core. But as soon as I put the core back in the stem, the resistance returns. Will try a core from my pile of un-patched inner tubes…

[andystow]

Is it set up tubeless? I sometimes have to clear out sealant clogs.

If not, can you get air in with the valve out? It should be very easy. If you can, try replacing the core.

[Author]

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