No Schrader to Presta adaptor
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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
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
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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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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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This, unless one is really bad at attaching and removing the pump valve chuck on and off the valve. Then the added support of the valve stem might reduce a valve base issue which would be caused by the wagging or twisting that some do when dealing with a pump chuck. But once aired up the PV in a SV hole needs no added support during riding. Andy
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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.
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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
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.
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This is what to look for:
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I've been doing this for years, albeit inadvertently. Wore out a rim, rebuilt the wheel with a new one, and didn't notice the new rim was drilled for Shrader. If I'd noticed, I'd have put on a rubber bushing, or cut a hole in the middle of a 1" square of old inner tube. But it's working fine, so if it ain't broke, why fix it?
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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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Some 40 years ago I had some Wolber tubes where the presta valve was held onto the rubber tube by a screwed-down nut, rather than being vulcanized/bonded onto the rubber. They would work for a bit, but eventually all became self-flatting as the rubber stressed around the nut.
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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.

Last edited by DiabloScott; 09-26-22 at 02:00 PM.