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Presta valve stem through Schrader rim

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Presta valve stem through Schrader rim

Old 06-18-10, 01:52 PM
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milkbaby
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Presta valve stem through Schrader rim

I searched, but wanted to see if anybody had adverse problems running a Presta tube through a Schrader valve hole by putting a Presta locking nut on the valve stem inside of the rim hole. I don't want to get a blowout from the tube squeezing through the bigger hole though it seems like the rubber is probably thicker at the valve stem/tube joint. On the other hand, I don't want the tube to rub on the little nut and blow out either.
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Old 06-18-10, 02:14 PM
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go to the hardware store and buy some rubber grommets or rubber washers
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Old 06-18-10, 02:31 PM
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I've done it with no ill effects. But do remove any sharp edges from the valve hole before useing the rim.
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Old 06-18-10, 06:45 PM
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There are adapters available for Schraeder hole/Presta stem use. One type is machined aluminum, and the other is rubber. I have used both types sucessfully (on different wheels). Being made for this purpose, they are a safe way to use Presta tubes with Schraeder-drilled rims.
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Old 06-18-10, 07:43 PM
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Here are the machined Al adapters badamsjr recommended:

http://www.biketoolsetc.com/index.cg...tem_id=WB-PSS1

And here are the rubber grommets:

http://www.loosescrews.com/index.cgi...d=829061627571

There are also presta valve locking nuts with a raised cylindrical ridge on one side made specifically to fill in the excess diameter of a Schrader drilled rim when used with presta tubes. My LBS had some but I don't know of another source for obtaining them. I would not trust a plain presta nut.
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Old 06-19-10, 01:23 AM
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rubber grommets +1. Cheap, light and effective.
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Old 06-19-10, 03:21 AM
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When I use cloth-based rim strips I make sure to make the hole for the valve rather tight. With that as only fix, I have had zero issues running Presta valves through Schrader drilled rims.
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Old 06-19-10, 06:25 AM
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If you have a roll of rim tape-and are very cheap- you can just put a wrap or two around the valve stem to make it "tight".
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Old 06-19-10, 09:38 AM
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The aluminium adapter is by far the best answer.
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Old 06-19-10, 09:58 AM
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Originally Posted by rydabent View Post
The aluminium adapter is by far the best answer.
I think so, too. They're called "presta savers" and are by Wheels Manufacturing. Niagara has them for $2.49/pair through Amazon.
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Old 06-19-10, 10:34 AM
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Every shop I've ever been to sells the adapters alongside the inflation adapters.
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Old 06-19-10, 12:47 PM
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Originally Posted by HillRider View Post
There are also presta valve locking nuts with a raised cylindrical ridge on one side made specifically to fill in the excess diameter of a Schrader drilled rim when used with presta tubes.
All the Schwalbe presta nuts I have seen have this ridge on both sides. I did not know what it is for until I read this post.

BTW, I am using these Al presta savers http://www.blueskycycling.com/produc...sta-Savers.htm . I presume that they provide better support from the inner side of the rim that just using the ridged nut from the outside. Does this make sense?

Kam
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Old 06-19-10, 07:49 PM
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desconhecido
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Originally Posted by kamtsa View Post
All the Schwalbe presta nuts I have seen have this ridge on both sides. I did not know what it is for until I read this post.

BTW, I am using these Al presta savers http://www.blueskycycling.com/produc...sta-Savers.htm . I presume that they provide better support from the inner side of the rim that just using the ridged nut from the outside. Does this make sense?

Kam
I put the presta savers underneath the rim tape -- very smooth.
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