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  1. #1
    I descend on my face Twitchology's Avatar
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    Stupid rims/tubes question

    I have an old POS with schrader valves that needs new tires/tubes. Forgive the n00b question, but would the opening of the rim be to big for a presta valve, or would the lock ring take care of that?

  2. #2
    Tom (ex)Builder twahl's Avatar
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    Someone makes an adapter. The problem with using a presta in a shraeder valve rim is that if it moves, the valve stem can be nicked and cut. A quick search found these.

  3. #3
    Jamadian Sparrow
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    Hey twitchology,

    If you don't mind home-made, quick fixes I've got two ideas for you(both worked flawlessly over months of NY messengering, 'back-in-the-day' ):

    Take an old mtb inner tube & cut out a square of it, approx. 2.5 x 2.5 cm(you can even use the section from around the base of the valve, slightly thickened and pre-shaped for a circular projection!
    Make a neat little "x" cut w/an exacto or razor blade or if your handy carefully cut out a circle smaller than the presta valve diam. Slide this over the new presta tube before mounting and it acts like a grommet
    in the schrader rim hole. Cushioning and centering.

    Head over to your nearest well stocked hardware store(the one w/the little drawers & shelves of widgets & fasteners) and ask for actual small rubber grommets or bushings that will perform the same job.

    Since you mentioned, in no uncertain terms, this was your "beater" I don't think this will clash with any fashion/elite-ist, ego-pros you might ride with.

    All the best

    Gyrobine

  4. #4
    Senior Member
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    \why not just get schrader tubes?

  5. #5
    You need a new bike supcom's Avatar
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    There's no real advantage to using presta tubes in a rim drilled for schrader valves. In fact, if you need 26 or 27 inch tubes, you can get perfectly acceptable cheap tubes from walmart.

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