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  1. #1
    Member Aussomeman's Avatar
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    ok to use the same tubes in 25c and 35c tires?

    hi there-

    i just purchased a set of 35c cyclocross tires to use on my fixie/beater bike in the lovely winter weather we've just begun to have here in new england, and i had a question about the tube size. i'm running normal 700x25c tires on the bike now, and the tubes are sized at 700x19-26c, i believe. now, i'm assuming that i could install the 35c tires with the same tubes and they'd just expand, but i'm just wondering, is that going to present a problem when i switch back to the 25c tires? are the tubes going to stretch out to the point where they'll be too big for the 25c's? i know i could just go out and get different tubes, too, but i'm just wondering if i could avoid doing that if i need to.

    thanks!

    -steve

  2. #2
    The Red Lantern Rev.Chuck's Avatar
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    Putting them in the larger tires will stretch them some(more prone to puncture) and you might have a little trouble getting them back in the skinny tires as they will hold memory once stretched for a while. On the other hand this is the best way to get a "cheap" lite weight tube.
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  3. #3
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    undersized tubes also sometimes deflate much quicker when punctured because of the stretching, so it would be best to get the correct tubes

  4. #4
    Bike Junkie
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    I run 700 x 20-28C tubes in all my tires up to 35C just because I only like to keep one size lying around. Haven't noticed any increase in punctures or deflation rate. YMMV

    -s

  5. #5
    60mph in the 42 ring! Dave Stohler's Avatar
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    Undersized tubes tend to 'blow-off' patches while being inflated. If you're going to do this, bring a spare (new) tube along.
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  6. #6
    Senior Member DieselDan's Avatar
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    One point, don't try that with latax tubes.
    Bikes use brakes to stop.

    If your bike has breaks, don't ride it.

  7. #7
    sch
    sch is offline
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    Rubber fails catastrophically, without any warning, like a balloon pops. If
    the tube has any small defect, overinflation will tend to exacerbate that
    defect, cause it to propagate and thus fail when the defect opens into a
    hole. If you are lucky there will be no defects and you will get away with
    overinflation. If not you will find out rapidly. Worst case will be a series of
    pinholes that leak down over 1-2hrs. Save money and time by getting the
    right size tube for the tire. The valve area will be a definite stress site.
    Steve

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