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  1. #1
    Senior Member BigPolishJimmy's Avatar
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    May 2008
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    Loosing PSI or loosing my mind?

    A couple of weeks ago I took a day off to work on my bikes and go for a nice long ride. I wanted to test out the new tall stem that I installed on my Motobecane Nomade, so I top off the tires and load up my stuff and away I go. Not a minute later the bike is feeling squrrely and I look down to see my rear tire seems a bit more flabby than it should. These tires and tubes came with the bike from the original owner but I don't believe their too old. Well the thing is, I topped them off at 90-psi and then when I put the pump on the dial read around 70-psi. So I topped them off again to 90 and not a minute later the bike is squirrely again and the rear tire--which now has more of my weight on it due to the taller stem--seems flabby again. I decide to scrap my ride as I had spent most of my day installing cables and cleaning up my frankenbike. I pump up and ride home and by the time I'm home again everything seems flabby. I'm thinking 'great, got a slow pinch flat right away on my dirt/gravel road'. Fast-forward 2 weeks and I look at the tires and they still have air in them??? *scratches head* I expected this to be flat like my PUCH. Can a tube get old and decide not to hold 90-psi anymore???

  2. #2
    Senior Member
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    Apr 2008
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    Iowa City, IA
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    Have you submerged the tube in water looking for leaks? Maybe there is a small hole in the tube that doesn't leak much air until you put alot of pressure on it?

  3. #3
    Mr. Frowny Man Alathea's Avatar
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    Apr 2005
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    Valve stem loose?
    The Earth is degenerating these days. Bribery and corruption abound.
    Children no longer mind their parents, every man wants to write a book,
    and it is evident that the end of the world is fast approaching.
    --Assyrian Stone Tablet, c.2800 BCE

  4. #4
    Senior Member
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    Check for a leak. Take the tube out, put some air into it, and plunge it under water and rotate it through looking for a stream of bubbles. Sounds like you have a slow leak.
    -------

    Some sort of pithy irrelevant one-liner should go here.

  5. #5
    Senior Member deraltekluge's Avatar
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    Sep 2006
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    Once upon a time, I had a tire go absolutely totally flat overnight, after topping it up and riding about 10 miles. Pumped the tire up, and it never had a problem again. My guess is that there was a tiny bit of dirt in the valve.

  6. #6
    Gorntastic! v1k1ng1001's Avatar
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    Oct 2006
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