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  1. #1
    Senior Member
    Join Date
    Jul 2006
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    Presta Tubes - Losing Air - Culprit Found!

    I could not figure out why I was losing air in my presta tubes, then I figured it out... the valve cores had come a little loose

    - when submerged completely underwater, I could see air bubbles coming from the valves (and nowhere else on multiple tubes that had the same symptoms). At first I had not submerged the valves themselves, thinking the problem was a pinprick puncture in the tube body.

    The solution, just tighten the cores - there are flat faces/sides on the cores that let you use a suitable wrench or set of pliers to twist them.

    Figured I might post this for anyone else with the same maddening symptoms.
    These were Schwalbe 6 and 6A tubes.


  2. #2
    Each Drop of Sweat Counts
    Join Date
    Nov 2007
    Iwakuni Japan
    My Bikes
    MASI Speciale Road, Specialized Rockhopper 29'er, Dahon Jetstream XP, Dahon Speed P8, Dahon Speed TR, Dahon Speed TT, Ignio Folding bike
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    Thanks for the post. I've had some problems with Schwalbe tubes in the past and stumbled across some Continental tubes that I run in some of my folders. I've never so much as had a flat on those tubes.

    I had three tubes in a row go recently with no visible problems whatsoever. I dropped in my Continentals without doing any other thing and no problems at all. At this point I'm convinced it was a quality control problem and not something making the tubes go flat.


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