2

I have the all too familiar problem of being unable to pump up my tyre :(

It's not a problem with the pump (because it works on the other wheel) so I guess there must be something wrong with the schrader valve. I've done all wiggly woggly poking efforts to get it to release air, tightening, untightening the pump head etc. to no avail (I just keep pressurising the pump instead of the tyre). However the valve doesn't "look" damaged (the pin is in place, straight, not obviously damaged).

Is there any other possible fix to this that I haven't tried? Some clever tip or trick? Or should I just give it up and buy a new inner tyre?

  • 4
    If you push the pin on the valve on the tire (with a small screwdriver or key), does air go out? – Batman Nov 1 '16 at 0:35
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    Got any practical jokers who might have squirted glue in your valve ? Could be excess sealant jambed up the core? A Core Removal tool might be helpful if you have one, but a new tube is relatively cheap, so replace it for the quick fix. – Criggie Nov 1 '16 at 4:40
5

Sounds like the valve has stuck shut, this can happen if the rubber seal at the base of the valve swells up. If the valve core is replaceable just get the appropriate valve tool and a replacement core, both are really cheap.

Otherwise its likely to require a replacement tube.

0

It is very hard to remove an inflated tube, so you need to let the air out. Since the valve isn't working you need to do it another way

  • Puncture the inner tube with something sharp. Go through the tread not the sidewall. You might be surprised how hard this is to do. Use something small so to minimise the hole in your tyre.

  • Bolt cutters - snip the entire valve stem off close to the rim. This will deform the valve stem to squash it back to round before pulling through the rim. Also mind out for a loud PSSSHHT of air.

If the tube is flat already just lever the tyre off the rim like normal.

If the tyre is End Of Life, just cut the whole thing off with a sharp knife. Take care to not cut your rim or rimtape, and then lever the bead wires off like normal.

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I have the same problem with Schrader valves. I have replaced the core. The valve still will not let air out, and has a lot of resistance letting air in. The pin in the new Schrader valve is mobile when screwed into the valve stem. The actual air seal in the valve STEM must be stuck somehow. A bit of air did go in, but what an effort it was. Very very stiff. Now the tire is round, sausage shaped, not flat anymore. I've sprayed lubricant into the valve, put the core back three times, pumped the pin up and down, up and down... whatever is inside will not come loose. I know I can just get a new inner tube, but I'm still frustrated. The bicycle stood for 18 months till I found time to fix it.

  • Probably the tube contained "sealant". And you did further damage with the spray lube. Get a new tube. – Daniel R Hicks Jul 6 at 11:27
  • New inner tubes cost only a couplefew pounds/euros/dollars. I don't understand why you'd put so much effort into a malfunctioning valve. – David Richerby Jul 6 at 19:05

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