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  1. #1
    Join Date
    May 2008
    Location
    northern Virginia
    Posts
    5,897

    Can valve stems be replaced?

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    I just put new tires and tubes on my mountain bike last night. The tubes have been sitting in my closet for several years, never used. (I haven't ridden this bike in at least 4 years.)

    When I got home from work tonight, I found the front tire had gone totally flat. I removed the tube, pumped it up, and immediately felt the air slowly leaking out of the valve. The tube itself has no holes.

    Is it possible to have the valve stem replaced, or is the tube trash? It's a schrader.

    I'm not even sure what brand it was...

    - Gray 2010 carbon WSD road bike, Rivet Independence saddle
    - Red hardtail 26" aluminum mountain bike, Bontrager Evoke WSD saddle
    - Royal blue 2018 aluminum gravel bike, Rivet Pearl saddle

    Gone but not forgotten:
    - Silver 2003 aluminum road bike
    - Two awesome worn out Juliana saddles

  2. #2
    Join Date
    Apr 2009
    Location
    Tucson, AZ
    Posts
    4,632
    That happens to me a fair bit. (For me, it's not the valve, but the rubber around the valve.)

    The tube is trash, since you can't really replace the valve as far as I know, and if it is the rubber, that area is going to be hard to patch.
    At least I don't leave slime trails.
    http://wholecog.wordpress.com/

    2009 Giant Avail 3 |Specialized Jett 143

    2013 Charge Filter Apex| Specialized Jett 143
    1996(?) Giant Iguana 630|Specialized Riva


    Saving for the next one...

  3. #3
    Join Date
    Sep 2011
    Location
    Southern Colorado
    Posts
    13

    Replacement valve cores.

    You should be able to replace the valve core on any Schrader valve. You just need a valve core tool and the new valve core.

    Valve cores on some presta valves can also be replaced, but this is becoming less common.

    Do a Google search for "schrader valve core" and "valve core removal tool" to see what you're looking for. A plastic valve core removal tool comes with Slime tire sealant. (Not that I'm recommending Slime. )

  4. #4
    Join Date
    Jan 2006
    Location
    Massachusetts
    Posts
    2,556
    Some tubes do have replaceable valve cores. There is a tool (used to come on lots of valves year ago) used to unscrew a valve core and replace it. However, if you take it to a bike shop, they'll probably just replace the tube.
    Oil is good, grease is better.

    2007 Peter Mooney w/S&S couplers/Terry Butterfly
    1993 Bridgestone MB-3/Avocet O2 Air 40W
    1980 Columbus Frame with 1970 Campy parts
    1954 Raleigh 3-speed/Brooks B72

  5. #5
    Join Date
    Sep 2007
    Location
    Uncanny Valley
    Posts
    14,498
    If it's a Schraeder valve and you don't have a LBS you trust not to argue with you and try to sell you a new tube, take it to a motorcycle shop.


    That's provided it actually is the valve core, and not the attachment of the valve stem to the tube where Owlie mentioned. You dunked it in water and all that I assume.
    Speed comes from what you put behind you. - Judi Ketteler

  6. #6
    Join Date
    May 2008
    Location
    northern Virginia
    Posts
    5,897
    I didn't need to dunk it in water. I can feel the air coming out of the valve. Like when you push in the pin, only not as fast.

    - Gray 2010 carbon WSD road bike, Rivet Independence saddle
    - Red hardtail 26" aluminum mountain bike, Bontrager Evoke WSD saddle
    - Royal blue 2018 aluminum gravel bike, Rivet Pearl saddle

    Gone but not forgotten:
    - Silver 2003 aluminum road bike
    - Two awesome worn out Juliana saddles

 

 

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