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my Sons bike has slime inner tubes. The bike has been sitting in the garage since last summer and the front tyres valve now seems blocked. Its has what feels like 15-20 psi in it but I can not get the valve to let any air out or take any more in.

I have no idea at this point how to get it to unblock the valve so I can use it again. For that matter I don't know how I could get the tire off as it has a reasonable (not ridable) amount of air in it without slashing the tyres (nice kings 2.2 which are pretty new).

I have tried putting the pump on it and putting a bit of air into it to try and clear the blockage but that didn't do anything.

Any ideas please?

Regards

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Unscrew the valve all the way, press it all the way down with your finger, install pump, and apply 100 PSI. If that doesn't free it, saw off the valve stem or cut it with bolt cutters. Until you get around to it, position the tires with the stem at about the 5-oclock position. – Daniel R Hicks Apr 1 '12 at 14:44
    
I would go the bolt-cutter way too. I think old slime-filled tubes in this condition are doomed already, no need to save them. – heltonbiker Apr 1 '12 at 17:01
2  
If it is a Presta don't forget to remove the retaining nut before cutting it off. – mikes Apr 1 '12 at 21:45
up vote 3 down vote accepted

Use a valve core tool to remove the core of the valve, and then clean it using a light solvent.

Valve core tool Schraeder Valve Core

It should be only a few minutes work. If there is a lump in the flat tire, the slime may have hardened, and the tube may need to be replaced, either way.

Hope that helps.

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If I'm not mistaken, the OP mentioned presta valve, and your images look like referring to schraeder valve? – heltonbiker Apr 1 '12 at 16:09
    
Even some presta valves have removable cores. I did specify Schraeder valves in my answer, though. Btw, the valve core in the left side of the right hand photo is a presta valve core. – zenbike Apr 1 '12 at 18:04
    
either way.. assuming you can do this for presta or schraeder I am not fussed, the advice seems good to me. I need to go to the LBS tomorrow AM as do not have that tool. – Jon Apr 1 '12 at 20:47
1  
@Jon -- I've never seen a Presta with a removable core. I suppose they do exist, but they're rare as hen's teeth. And if you do happen to have one you'd need something different from the Schraeder valve tool (which is more readily available from an auto parts place) to remove the core. – Daniel R Hicks Apr 1 '12 at 22:25
1  
You can get those valve core tools for cheap, 4 for a dollar sometimes (dont think about using the plastic ones that come with slime, they break off in your valve and are a pain to get out). Go to a tire shop like Big-O or even a Walmart with a TLE and ask for a used valve, they usually replace your valve with a new tire. Take the valve and shave off the rubber around the bottom and superglue the core tool to the valve, wait for it to dry and stick it in your coin purse. I always carry mine with me!! – BillyNair Jun 1 '12 at 6:55

Here's what I did. I have a Schrader valve so I remove the core as mentioned above. Then, I took an old fondue stick that I had and I used a wire cutter to cut off the fork end. This was a perfect diameter to then place inside the hole. When I put it in the hole it was hard to the touch so I gently went in and out until I started hearing a little bit of air coming out. I continue to do this until I was finally able to break through and it went into the tube. I have to note that I was lucky that I wasn't pressing too hard because if I would have been pressing harder it might have punctured the tube on the other side when i brole through. Now it works fine and I was able to fill up with air again.

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