Bicycle Mechanics - Stupid rims/tubes question
Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.
09-06-04, 05:31 PM
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?
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. (http://www.branfordbike.com/tires/tire9.html#item1)
09-06-04, 06:20 PM
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
\why not just get schrader tubes?
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.
Powered by vBulletin® Version 4.1.12 Copyright © 2013 vBulletin Solutions, Inc. All rights reserved.