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Presta valve adapters for Schrader rims?

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Presta valve adapters for Schrader rims?

Old 11-16-17, 07:00 AM
  #1  
Sharpshin
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Presta valve adapters for Schrader rims?

I'll 'fess up, preparing my bike for the aftermath of the Zombie apacalypse is a relatively inexspensive obsession 🙄. For example when I had uber strong 36 spoke 26" wheels built (26" wheels reported here as being more common in Macchu Picu or Timbuktu or whatever) a couple of years back, I went with Shraeder rims for that same reason.

It hadn't occurred to me that Shraeder/Presta rim adapters even existed until the metal adapter fell off one of the custom 700c "Presta" wheels I had on my touring bike while I was fixing a flat (fortunately I was on asphalt so I could find it, on grass I mighta been SOL).

Seems like Presta valve rim adapters would be a common-sense thing to bring along on tour if one has Shraeder rims, and that Shraeder rims with Presta valve adapters might be an obvious feature to have on a World-touring expedition bike.

Yet I don't recall valve adapters ever being mentioned here. I unknowingly rode quite a few thousand miles with them on my '89 Voyageur without a problem and I'm thinking of throwing a set on my current 26" commuter/touring project bike so I can run Presta valves.

OK, besides the obvious liability of losing one while fixing flats, is there any down side to these things?

Mike

Last edited by Sharpshin; 11-16-17 at 07:05 AM.
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Old 11-16-17, 10:13 AM
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I always run Presta tubes but I wanted to be able to use a Shrader tube in a 26 inch wheel just in case I was stranded in small town Shraderville somewhere. So I drilled my 26 inch rims for Shrader, but run Presta tubes.

Wheels Manufacturing makes metal ones. I had a flat develop in the tube near the stem on my Presta tube, a friend of mine that works as a bike mechanic was there and saw where the puncture in the tube was and said that the adapter probably had too a sharp edge.
Presta | Stem | Savers | Bicycle

After that I bought some Mavic ones and am slowly replacing the metal ones with a Mavic one each time I pull a tire off a wheel.
https://www.sjscycles.co.uk/rims-tap...resta/?geoc=US
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Old 11-16-17, 10:37 AM
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I also prefer more positive filling presta valves and added both the metal and rubber grommet versions of these adapters to several of my vintage shrader drilled bike rims. I've had no issue with either although I have encountered a tube or two with very short stems that didn't stick out of the metal adapter far enough to catch my pump head very well. However the metal ones give the stem more stability than the rubber versions I have. I think I may have purchased both types through Nashbar.
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Old 11-16-17, 01:27 PM
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There aren’t any important downsides to the adapters.
OTOH if you put them in the hubwards layer of a double-wall rim, there isn’t any important advantage to them either.

On 26” rims I haven’t used them in decades.
I poke a tight hole in the rim tape, and that’s been enough. Even on the roadified commuter using 1.1-1.3” tires at 6 bar.
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Old 11-16-17, 01:30 PM
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I use a WHEELS MFG adapter on the rear wheel of my mountain bike. Never had an issue.

The wheel takes way more abuse than any road wheel does- rocks, torque from hard turns, tree roots and logs, as well as my 230#- and the adapter hasnt been anything to think about.
nice little solution.
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Old 11-16-17, 02:34 PM
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3 kinds: Mavic has a plastic one that snaps in place, the common aluminum one,

and Schwalbe presta tubes have a stepped ring-nut that centers the stem in a schrader hole.

4th is a rubber grommet but they would be found as general hardware, not just bike shop suppliers..
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Old 11-16-17, 10:11 PM
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My bikes are bikes not cars and have no need for car tire valves. If there is a zombie whathaveyou I will be happily living in a remote forest somewhere with my best friend in a treehouse near a waterfall, maybe we might be zombies, that could be fun...
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Old 11-17-17, 05:50 AM
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Originally Posted by Tourist in MSN View Post
I always run Presta tubes but I wanted to be able to use a Shrader tube in a 26 inch wheel just in case I was stranded in small town Shraderville somewhere. So I drilled my 26 inch rims for Shrader, but run Presta tubes.[/URL]
Easiest thing, drilling the hole in the rim wider and using the Shrader valves/tubes you want.

I've done that on all my MTBs. I like the idea that I can pump up the tyres at a gas station if I need/want to, without carrying the adapter, which I might forget, lose, etc. And I am not aware of any real world disadvantage of Shrader valves on MTBs, or similar low pressure tyres,

Oh, and it's much easier to fill the tubes with sealant on a Shrader valve, too.
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Old 11-17-17, 09:04 AM
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I use Presta tubes in Schrader rims without any grommet. I carry the Schrader-Presta infllating adpater in my tool kit.
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Old 11-17-17, 11:24 AM
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Both Continental and Schwalbe inner tubes come with stem nuts that are machined on one side to act as Presta adapters. I’ve seen similar Panaracer nuts sold individually online. I will often press one of the rubber adapters to the inside of the rim to prevent the tube being cut at the stem. I also paint all stem nuts and valve caps with red nail polish to make them visible in the roadside debris.
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Old 11-17-17, 03:26 PM
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Originally Posted by Western Flyer View Post
Both Continental and Schwalbe inner tubes come with stem nuts that are machined on one side to act as Presta adapters.
Nice to know! Thanks for the tip.
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Old 11-17-17, 03:35 PM
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Originally Posted by Western Flyer View Post
.... I also paint all stem nuts and valve caps with red nail polish to make them visible in the roadside debris.
Brilliant.
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Old 11-17-17, 04:22 PM
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Originally Posted by Tourist in MSN View Post
I always run Presta tubes but I wanted to be able to use a Shrader tube in a 26 inch wheel just in case I was stranded in small town Shraderville somewhere. So I drilled my 26 inch rims for Shrader, but run Presta tubes.

Wheels Manufacturing makes metal ones. I had a flat develop in the tube near the stem on my Presta tube, a friend of mine that works as a bike mechanic was there and saw where the puncture in the tube was and said that the adapter probably had too a sharp edge.
Presta | Stem | Savers | Bicycle

After that I bought some Mavic ones and am slowly replacing the metal ones with a Mavic one each time I pull a tire off a wheel.
https://www.sjscycles.co.uk/rims-tap...resta/?geoc=US
The Wheels Mfg one makes me feel uncomfortable.

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Old 11-17-17, 04:25 PM
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Originally Posted by Western Flyer View Post
Both Continental and Schwalbe inner tubes come with stem nuts that are machined on one side to act as Presta adapters. I’ve seen similar Panaracer nuts sold individually online. I will often press one of the rubber adapters to the inside of the rim to prevent the tube being cut at the stem. I also paint all stem nuts and valve caps with red nail polish to make them visible in the roadside debris.
With the stem nuts being used for presta adapters it is important not to lose them. Painting them a bright color is a good idea.

I don't usually loose the stem nuts. I take them off when I unpack new tubes, and put them in my tool box for safe keeping However, my wife insists on using stem nuts on her bikes, because some guy in a bike shop told her they should be used. We agree to disagree.

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Old 11-17-17, 10:01 PM
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Doug, fun to see other peoples "stuff" or "junk" drawers.

I personally use pill bottles for all my little doohickies---have to look at the bottles closely to remember what doohickie is in which pill bottle, but then at least I cant knock over a drawer and have multiple various doohickies fall down into the drain in the middle of my garage floor
;-)
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Old 11-17-17, 10:46 PM
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Originally Posted by djb View Post
Doug, fun to see other peoples "stuff" or "junk" drawers.

I personally use pill bottles for all my little doohickies---have to look at the bottles closely to remember what doohickie is in which pill bottle, but then at least I cant knock over a drawer and have multiple various doohickies fall down into the drain in the middle of my garage floor
;-)
That is my Misc. (junk) drawer. I am a little better organized with other things, using those little cabinets with about 30 small drawers in them, and even have a spread sheet with inventory and drawer number. About once a year, I'll sort out the junk drawer "stuff" into the appropriate bin.
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