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  1. #1
    SERENITY NOW!!! jyossarian's Avatar
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    Valve Extenders - What am I doing wrong?

    I have Velocity Deep V's which require tubes with long presta valves. The spare tubes use regular length presta valves so I bought a valve extender that screws onto the presta valve to make it long enough to use with the Deep V rims.

    Well today I had a flat so I swapped the tube and added the valve extender. I removed the nut that holds the valve against the outside of the rim and put the extender on and finger tightened as much as I could. I made sure to loosen the nut on the valve so I could inflate it before I put the extender on. The extender itself doesn't have a tightening nut and is really just a long cylinder that threads onto the valve. When I started pumping, I couldn't inflate the tube more than maybe 30-40lbs/in pressure before the air would would leak around the seal between the pump and valve extender. This wasn't enough to ride on so I ended up walking the rest of the way to work.

    Does anybody have any experience with these extenders? What am I doing wrong? Any insight would be appreciated.
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  2. #2
    Isaias NoRacer's Avatar
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    Does the extender require you to use tubes with a removable valve core? If so, did you move the valve core to the end of the extender?
    2009 mileage = 14,738 miles; 2010 mileage = 15,234 miles; 2011 mileage = 17,344 miles; 2012 mileage = 11,414 miles; 2013 = 12,169

  3. #3
    SERENITY NOW!!! jyossarian's Avatar
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    Quote Originally Posted by NoRacer
    Does the extender require you to use tubes with a removable valve core? If so, did you move the valve core to the end of the extender?
    Nope. The only thing I can see from the instructions that I didn't do was wrap the valve w/ teflon plumbers tape.
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  4. #4
    34x25 FTW! oboeguy's Avatar
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    I'm not too good with valve extenders either. I've had better luck, when there's enough valve stem sticking out, with the a Schraeder adapater as an "extender".
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  5. #5
    These go to 11. DavidLee's Avatar
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    Forte road tubes from Performance have long valve stems, might be worth checking out.
    Last edited by DavidLee; 06-19-06 at 10:19 AM.
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  6. #6
    Senior Member mechBgon's Avatar
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    If you do want to use valve extenders, use Teflon plumbers' tape on the threads of the valve, or pipe-thread sealant, you know the toothpaste-type stuff. But the long-valve tubes are sounding like a winner here

  7. #7
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    Quote Originally Posted by jyossarian
    I have Velocity Deep V's which require tubes with long presta valves. The spare tubes use regular length presta valves so I bought a valve extender that screws onto the presta valve to make it long enough to use with the Deep V rims.

    Well today I had a flat so I swapped the tube and added the valve extender. I removed the nut that holds the valve against the outside of the rim and put the extender on and finger tightened as much as I could. I made sure to loosen the nut on the valve so I could inflate it before I put the extender on. The extender itself doesn't have a tightening nut and is really just a long cylinder that threads onto the valve. When I started pumping, I couldn't inflate the tube more than maybe 30-40lbs/in pressure before the air would would leak around the seal between the pump and valve extender. This wasn't enough to ride on so I ended up walking the rest of the way to work.

    Does anybody have any experience with these extenders? What am I doing wrong? Any insight would be appreciated.
    Yep...i use Hutchinson Race tubes with 3" stems

  8. #8
    SERENITY NOW!!! jyossarian's Avatar
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    Yeah, I'm gonna swing by the LBS for the proper tube, but this is what I had with me, so I figured I must've been doing something wrong. I don't have any plumbers tape in my tool kit, just a wrench, tube and levers.
    HHCMF - Take pride in your ability to amaze lesser mortals! - MikeR



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  9. #9
    o.O Seggybop's Avatar
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    I squeeze the pump head onto the valve really hard while pumping and that seems to take care of the leaking.
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  10. #10
    SERENITY NOW!!! jyossarian's Avatar
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    Turns out plumbers tape or an O-ring is what I needed to make the extender seal properly. I don't have either in my toolkit, so instead I got some tubes w/ extra long valves that did the trick. I guess I could've gotten some plumbers tape at Home Depot. I was about 8 blocks away, but I didn't think of it at the time. Thanks all!
    HHCMF - Take pride in your ability to amaze lesser mortals! - MikeR



    We demand rigidly defined areas of doubt and uncertainty!

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