No Schrader to Presta adaptor
The rim on my rear wheel started cracking apart, so I got a new wheel. Unfortunately the new wheel is drilled for Schrader valve stems instead of the Presta stems which I use. I know they make adapters to fit in the holes, but I won't be able to get back to the bike shop for a while. So what I did was screw one of the flat Presta nuts all the way down on the stem before inserting it through the hole, then another one on the outside like normal. Is there any issue in doing this, if even temporarily? I think this is a better solution than not putting anything on the inside part of the stem. I run 90 PSI in my tires so I would be afraid the stems would blow out if I didn't have anything holding them back.
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Then have them delivered to your door.
https://www.amazon.com/Quad-Wheels-M...-23&th=1&psc=1 Or rubber grommet style: https://www.amazon.com/Pack-Schrader...%3D%3D&sr=8-21 |
Originally Posted by Milton Keynes
(Post 22658054)
So what I did was screw one of the flat Presta nuts all the way down on the stem before inserting it through the hole, then another one on the outside like normal. Is there any issue in doing this, if even temporarily? I think this is a better solution than not putting anything on the inside part of the stem. I run 90 PSI in my tires so I would be afraid the stems would blow out if I didn't have anything holding them back.
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Continental presta tubes have a shoulder on the locknut that sits in a Schrader hole to secure the presta valve.
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A short piece of thick heat shrink [marine grade] is what I did for a rim I used in the past. I pre-installed the spare tubes I carried once I found the ideal length needed.
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We used to use thin washers bent to the curvature of the rim. That was before the narrow center channels. Now I'd probably do the same, then grind flats on the sides of the washers so they fit in the channel. (I never did this. I was a sewup only guy.)
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Originally Posted by dmark
(Post 22658104)
Continental presta tubes have a shoulder on the locknut that sits in a Schrader hole to secure the presta valve.
Originally Posted by Milton Keynes
(Post 22658054)
The rim on my rear wheel started cracking apart, so I got a new wheel. Unfortunately the new wheel is drilled for Schrader valve stems instead of the Presta stems which I use. I know they make adapters to fit in the holes, but I won't be able to get back to the bike shop for a while. So what I did was screw one of the flat Presta nuts all the way down on the stem before inserting it through the hole, then another one on the outside like normal. Is there any issue in doing this, if even temporarily? I think this is a better solution than not putting anything on the inside part of the stem. I run 90 PSI in my tires so I would be afraid the stems would blow out if I didn't have anything holding them back.
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Or don't worry about it. My wife's bike has had Presta tubes in Schrader rims for decades without an issue, with high pressure road tires.
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Originally Posted by andrewclaus
(Post 22658279)
Or don't worry about it. My wife's bike has had Presta tubes in Schrader rims for decades without an issue, with high pressure road tires.
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Originally Posted by Milton Keynes
(Post 22658054)
So what I did was screw one of the flat Presta nuts all the way down on the stem before inserting it through the hole, then another one on the outside like normal.
You can pick up various diameters of rubber grommets for electrical wiring at almost any hardware store. Chances are you can find a size that fits the rim and valve perfectly. |
Originally Posted by phughes
(Post 22658056)
Then have them delivered to your door.
https://www.amazon.com/Quad-Wheels-M...-23&th=1&psc=1 Or rubber grommet style: https://www.amazon.com/Pack-Schrader...%3D%3D&sr=8-21 Or, even better, shouldered presta nuts. I find them easier to use than any other grommet. |
1 Attachment(s)
Originally Posted by Chuck M
(Post 22658177)
I have had them on some Kenda tubes as well. I save them as I come across them for using on Schrader rims.
Look around on your other bikes, you may have one of the shouldered nuts on one of them you can use unless you don't use the nuts on your Presta tubes. |
Originally Posted by andrewclaus
(Post 22658279)
Or don't worry about it. My wife's bike has had Presta tubes in Schrader rims for decades without an issue, with high pressure road tires.
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drill a new port for the presta valve in the rim somewhere else?
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The Continental presta valve tubes that I bought from Amazon came with shouldered presta nuts.
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Originally Posted by Trakhak
(Post 22658338)
Bad idea, if the flat Presta nut prevents the rubber at the bottom of the valve stem from sitting flush on the rim's inner surface. The inflated tube will try to fill that gap, possibly stretching the rubber thin enough to fail.
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Originally Posted by Milton Keynes
(Post 22658054)
So what I did was screw one of the flat Presta nuts all the way down on the stem before inserting it through the hole, then another one on the outside like normal. Is there any issue in doing this, if even temporarily? I think this is a better solution than not putting anything on the inside part of the stem. I run 90 PSI in my tires so I would be afraid the stems would blow out if I didn't have anything holding them back.
Second option would be to use a nut or washer. Chances are you don't need it... but depends on rim/tube matchup. If you don't have a rim-cuts-the-valve problem, the grommet won't solve anything. I ran this setup for years - no problems except some water inside the rim during the puddle season. https://cimg5.ibsrv.net/gimg/bikefor...c4a5dedd66.jpg |
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