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Old 09-06-04, 05:31 PM   #1
Twitchology
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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?
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Old 09-06-04, 06:06 PM   #2
twahl
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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.
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Old 09-06-04, 06:20 PM   #3
Gyrobine
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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
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Old 09-06-04, 06:27 PM   #4
ad6mj
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\why not just get schrader tubes?
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Old 09-06-04, 08:10 PM   #5
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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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