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Can't find the puncture hole.

  • 26-05-2022 9:47pm
    Registered Users Posts: 26,057 ✭✭✭✭ Terry

    So I slowly ran the tube through the kitchen sink 5 times, and couldn't see any air bubbles.

    Tried holding the valve under for about 30 seconds too, and nothing.

    It's a second-hand bike. I know this because of the dirt on the tube (not my bike, just doing a favour), but there are no patches on the tube, so that's obviously new.

    Anyone know what the craic is here.

    The valve is one of the really skinny ones.


  • Registered Users Posts: 2,626 ✭✭✭ niallb

    How much pressure did you have in the tube when you held it under?

  • Registered Users Posts: 22,210 ✭✭✭✭ ted1

    Buy a new tube, but if you can’t see bubbles you are either not squeezing it. Or it the nozzle , put it under abs the move

  • This maybe? I haven't had this in 20 odd years though and it was my Dad's bike back then when it happened.

  • Registered Users Posts: 1,916 ✭✭✭ JMcL

    How quickly is it going down? I've always found even the slowest punctures can be found by holding the tube under water - including air leaking from the valve. I usually use a basin and make sure it's in good light. For very slow punctures it might take a couple of rounds - slide your hand along the tube while underwater to clear away any air bubbles sticking to it, then hold each section under for a few seconds. Also try inflating it a bit more

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  • Registered Users Posts: 11,646 ✭✭✭✭ tomasrojo

    Yeah, make sure to stick the valve under the water too, as said. You could try inflating the tube a bit more, as also said, as some small punctures remain closed at low pressure.