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Thread: Valve question

  1. #1
    Paleo Pennsylvania TJohn's Avatar
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    Valve question

    Took my bike to my LBS for a check up and while I was there I had them install some new tires. Once I got home I wanted to adjust the pressure and noticed that they gave me a different tube on the rear with what looks to be a schrader valve but it has a screw top like a presta?? And I can't seem to work it right, using my pump, I pump 3 times and it says 120 then continues to drop. I can't seem to be able to read what the pressure is. I don't like it Does anyone know what kind of valve it is and am I doing something wrong?

  2. #2
    Senior Member CACycling's Avatar
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    I don't believe there is a third option for valves on tubes so I am assuming it is a presta. It sounds like you are not seating the pump far enough on the valve to open it up. Make sure the lock nut is fully unscrewed and that you have the pump fully down on the valve.

  3. #3
    Senior Member 04jtb's Avatar
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    maybe a presta-schraeder adaptor on there? what I use when pumping the tyres, just i take it off after
    Quote Originally Posted by cc700 View Post
    i jam my thumbs up and back into the tubes. this way i can point my fingers straight out in front to split the wind and attain an even more aero profile, and the usual fixed gear - zen - connectedness feeling through the drivetrain is multiplied ten fold because my thumbs become one with the tubing.
    A group for all Dawes Galaxy owners to give and recieve information about them
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  4. #4
    Paleo Pennsylvania TJohn's Avatar
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    I thought I unscrewed it until is stopped, but if it's an adapter it should come right off without any force correct?

  5. #5
    Senior Member 04jtb's Avatar
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    Yeah, it may not (probably isn't) an adaptor, it was just a thought
    Quote Originally Posted by cc700 View Post
    i jam my thumbs up and back into the tubes. this way i can point my fingers straight out in front to split the wind and attain an even more aero profile, and the usual fixed gear - zen - connectedness feeling through the drivetrain is multiplied ten fold because my thumbs become one with the tubing.
    A group for all Dawes Galaxy owners to give and recieve information about them
    http://flickr.com/groups/dawes_galaxy/

  6. #6
    Paleo Pennsylvania TJohn's Avatar
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    No, it must be an adapter since there are only 2 kinds of valves. My front is a presta. I'll check it when I get home.

  7. #7
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    Sometimes with presta valves it helps to let a little air out before you put the pump on it. On some of my tubes, this seems to help the pump open the valve when you start pumping.

  8. #8
    Small Member maddmaxx's Avatar
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    Quote Originally Posted by CACycling View Post
    I don't believe there is a third option for valves on tubes so I am assuming it is a presta. It sounds like you are not seating the pump far enough on the valve to open it up. Make sure the lock nut is fully unscrewed and that you have the pump fully down on the valve.
    It is not a good idea to press the pump down far enough to push on the rod in a presta valve. This is how the valve gets damaged and bent. Air pressure greater in the pump than in the tube will cause the presta valve to open. However, as mentioned in another post above, a quick tap with the finger to burp out some air before hooking up the pumb will unstick frozen valves.

  9. #9
    rebmeM roineS JanMM's Avatar
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    Was it a Dunlop valve? Never seen one but they exist.
    http://en.wikipedia.org/wiki/Imageunlop_valve.jpg

  10. #10
    Paleo Pennsylvania TJohn's Avatar
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    Yeah, I'm a real dumb@@@, it was an adapter over my presta All is well now.

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