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  1. #1
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    Presta valve question

    Hi everybody!

    I needed a new pump as my Joe Blow had blown out. I got a great deal on a Syncros FP2.0 pump, but every time I unscrew the pump from the presta valve after filling the tube with air, it unscrews the presta valve instead of unscrewing the pump from the valve. Thus, it lets all the air out.

    Is there such a thing as a tube with a presta valve that does not unscrew mid-valve?

    Thanks!
    Dave

    ("great deal" is relative, since the pump keeps doing this...)
    Last edited by daveleau; 04-11-15 at 03:31 PM.

  2. #2
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    It doesn't just press on? Schade!
    Robert

    My hero: "Tar-Baby ain't sayin' nuthin'..." (Joel Chandler Harris, Uncle Remus")

  3. #3
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    This is what it does:
    syncros.gif

  4. #4
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    No, the entire metal head (silver and red in the pic above) rotates to screw onto the valve. If you try to push it on, it will not get air into the tube.

  5. #5
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    Quote Originally Posted by daveleau View Post
    This is what it does:
    syncros.gif
    You need cheaper tubes without removeable valve cores. But why not just get a pump head that only presses on? You don't need a pump head that screws on.
    Robert

    My hero: "Tar-Baby ain't sayin' nuthin'..." (Joel Chandler Harris, Uncle Remus")

  6. #6
    Senior Member GuitarBob's Avatar
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    My Lezyne pump screws on and I love it -- much harder to break off the top of a valve.

    OP. make sure the valve core is screwed in tightly (perhaps a drop of loctite if it won't behave, although I have never needed to do that) and only screw the pump head on enough to make a good seal.

  7. #7
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    Quote Originally Posted by rpenmanparker View Post
    You need cheaper tubes without removeable valve cores. But why not just get a pump head that only presses on? You don't need a pump head that screws on.
    I've only had a clamp on, which worked well. A couple of my buds have press on and they pop off a lot and ask for my pump. (Probably cheap, but they made an impression on me suggesting I avoid press on.) The screw on sounded good and the price was right, but I didn't think of the valve unscrew issue.

    Quote Originally Posted by GuitarBob View Post
    My Lezyne pump screws on and I love it -- much harder to break off the top of a valve.

    OP. make sure the valve core is screwed in tightly (perhaps a drop of loctite if it won't behave, although I have never needed to do that) and only screw the pump head on enough to make a good seal.
    Glad to hear you like yours. I'll add a proper-sized wrench to my gear bag, if simply tightening the setup works.

  8. #8
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    Quote Originally Posted by GuitarBob View Post
    My Lezyne pump screws on and I love it -- much harder to break off the top of a valve.

    OP. make sure the valve core is screwed in tightly (perhaps a drop of loctite if it won't behave, although I have never needed to do that) and only screw the pump head on enough to make a good seal.
    Okey, dokey. Never thought of breaking off the valve stem. You mean that actually happens?

    OP, you should have tiny wrench slots on the valve core and a tiny wrench for it. Make sure it knows who's boss!

    Are you using the removeable core type because you need to use a valve extender? Did you know there is a type of extender that just screws on the end of the open valve and doesn't need a removeable core? That might be an easy fix.
    Robert

    My hero: "Tar-Baby ain't sayin' nuthin'..." (Joel Chandler Harris, Uncle Remus")

  9. #9
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    Quote Originally Posted by daveleau View Post
    I've only had a clamp on, which worked well. A couple of my buds have press on and they pop off a lot and ask for my pump. (Probably cheap, but they made an impression on me suggesting I avoid press on.) The screw on sounded good and the price was right, but I didn't think of the valve unscrew issue.



    Glad to hear you like yours. I'll add a proper-sized wrench to my gear bag, if simply tightening the setup works.
    Yeah the press-on do work well especially if they are the locking type and have done so forever. The screw-on are just a way to transfer more money from your pocket to the pump makers'.
    Robert

    My hero: "Tar-Baby ain't sayin' nuthin'..." (Joel Chandler Harris, Uncle Remus")

  10. #10
    Senior Member GuitarBob's Avatar
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    I like removable cores too (sorry Robert), because when I do break off a value, I can overcome the damage caused by me being ham-fisted for a buck rather than tossing the tube. And I have never broken a value with a screw-on head, only with press-on heads.

    I wouldn't carry a special wrench for this. Tighten it up at home (needle-nose pliers work fine) and you should be good. That said, valve core tools (that include a built-in "wrench") are tiny:

    Park Tool Co. VC-1 : Valve Core Tool : Tube & Tire

  11. #11
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    Quote Originally Posted by daveleau View Post
    I needed a new pump as my Joe Blow had blown out. I got a great deal on a Syncros FP2.0 pump, but every time I unscrew the pump from the presta valve after filling the tube with air, it unscrews the presta valve instead of unscrewing the pump from the valve. Thus, it lets all the air out.
    I solved that problem with this accessory from Lezyne. It should work with any standard-threaded pump. The "ABS Flip Thread Chuck" has a button to allow you to vent the high pressure between the pump and the presta valve before you unscrew the pump. The chuck did not come standard when I bought my Lezyne floor pump and I unscrewed a couple of valve cores before finding the solution.

  12. #12
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    Quote Originally Posted by GuitarBob View Post
    I like removable cores too (sorry Robert), because when I do break off a value, I can overcome the damage caused by me being ham-fisted for a buck rather than tossing the tube. And I have never broken a value with a screw-on head, only with press-on heads.

    I wouldn't carry a special wrench for this. Tighten it up at home (needle-nose pliers work fine) and you should be good. That said, valve core tools (that include a built-in "wrench") are tiny:

    Park Tool Co. VC-1 : Valve Core Tool : Tube & Tire
    No apology needed. But I don't see the economics. In 32 years of Presta tube riding I have never broken a valve. Then add to that the fact that removable core tubes are invariably more expensive than the same weight non-removeable core tubes. You have to be so far in the hole to start with that no amount of core replacement savings could ever make up for it. Jus' sayin'.

    Now if you absolutely prefer the type of extender that requires the removeable core, well that is another thing entirely.
    Robert

    My hero: "Tar-Baby ain't sayin' nuthin'..." (Joel Chandler Harris, Uncle Remus")

  13. #13
    Stand and Deliver FLvector's Avatar
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    I've had just a few Presta valves fail over the years and have bent a few, but never broke one off. It was easy to straighten it back out with pliers and continue using. I have a screw on Lezyne floor pump, but prefer to use the Joe Blow pump with a press on head for daily use. Much easier and faster.

    I'd think all you need to do is tighten the valve as GuitarBob suggested.

  14. #14
    Senior Member GuitarBob's Avatar
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    Quote Originally Posted by rpenmanparker View Post
    But I don't see the economics.
    If tubes with removable valve cores were always more expensive than those with non-removable cores, then I'd be right there with you. But occasionally I find them on sale for less, so I buy 'em. And I've spent more time writing about it in this thread than I have thinking about it over my entire lifetime

  15. #15
    Senior Member
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    Quote Originally Posted by FLvector View Post
    I've had just a few Presta valves fail over the years and have bent a few, but never broke one off. It was easy to straighten it back out with pliers and continue using. I have a screw on Lezyne floor pump, but prefer to use the Joe Blow pump with a press on head for daily use. Much easier and faster.

    I'd think all you need to do is tighten the valve as GuitarBob suggested.
    Indeed I bent one the other day in a way that caused a leak. Quick fix with the needle nose just as you say. Gotta love brass.
    Robert

    My hero: "Tar-Baby ain't sayin' nuthin'..." (Joel Chandler Harris, Uncle Remus")

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