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presta valve in schrader hole

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presta valve in schrader hole

Old 03-09-09, 01:52 AM
  #1  
sunburst
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presta valve in schrader hole

I would bet money this has been asked a hundred times, but I've searched, and as usual came up empty.

I just popped my last schrader tube today. Is there any reason not to use a presta tube instead?

I'm asking because I've had multiple failures with tubes at the base of the valve (where it connects to the tube), and I figure the presta tube will wiggle a bit more in the hole, exacerbating the problem.
If I go this route, I'll certainly use a threaded presta valve, and be sure to clamp down the nut pretty tight on the rim.
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Old 03-09-09, 05:21 AM
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Originally Posted by sunburst View Post
I would bet money this has been asked a hundred times, but I've searched, and as usual came up empty.

I just popped my last schrader tube today. Is there any reason not to use a presta tube instead?

I'm asking because I've had multiple failures with tubes at the base of the valve (where it connects to the tube), and I figure the presta tube will wiggle a bit more in the hole, exacerbating the problem.
If I go this route, I'll certainly use a threaded presta valve, and be sure to clamp down the nut pretty tight on the rim.
First, you should use a valve stem adapter that "fill" the gap when a presta stem goes through a schrader hole. Ask for these at your LBS.

Second, if you think by "cranking" down on the nut you will solve the "roomy" hole problem ... you're on the wrong track (see "First"). "Cranking" down on the nut can cause as many tube failures as anything else. Matter of fact, once the tube is installed and properly inflated, the nut no longer serves a purpose.

So ... as long as the schrader hole is properly filled, there is no reason you couldn't use a presta tube in a scrader rim (assuming the presta is an acceptable size for the rim/tire).
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Old 03-09-09, 08:16 AM
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Originally Posted by tippy View Post
Matter of fact, once the tube is installed and properly inflated, the nut no longer serves a purpose.
That statement has always kinda irked me, it may not serve any purpose once its properly mounted, but you try inflating a tire without one. It's kinda like how brakes are useless unless you need to slow down. In my mind the presta valve nuts are pretty essential.
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Old 03-09-09, 08:21 AM
  #4  
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Nashbar Presta Valve Adapter((.99cents each) A must for what you need!
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Old 03-09-09, 08:31 AM
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Just put the the tube in and inflate. No need for adapters.
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Old 03-09-09, 09:31 AM
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I inflate presta valves without the nut all the time and it's never posed a problem to me.
Yes, you can use presta valves in schrader holes. No, this isn't ideal and it will fail there eventually. Yes, they make spacers to fix this issue. No I do not know where to get one, although the rubber bushings at the local hardware store may work.
Most valve stem failures are caused by one of three things:
Poor rim strip at the valve hole
Valve stem not perpendicular to the rim (improper installation)
Use of a hand pump with no hose opposed to a pump with hose such as a floor pump for regular inflation.
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Old 03-09-09, 09:36 AM
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http://aebike.com/page.cfm?PageID=30...ory=363&type=T

http://www.niagaracycle.com/product_...ducts_id=11703
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Old 03-09-09, 10:35 AM
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Originally Posted by fuzz2050 View Post
That statement has always kinda irked me, it may not serve any purpose once its properly mounted, but you try inflating a tire without one. It's kinda like how brakes are useless unless you need to slow down. In my mind the presta valve nuts are pretty essential.

Michelins aren't even threaded for a nut.


You just have to push down on the tire to poke the valve out until you get the pump head on. Probably more difficult with some kinds of tires and some kinds of pumps. I never use a nut on any of my bikes.

Back to OP - I've had prestas in my schrader rims for years and I think only once has a tube failed there. I tried the grommet thingies at first... found them hard to deal with and unnecessary. I'm just a little extra careful not to wiggle it when I remove the chuck.
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Old 03-09-09, 10:45 AM
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I don't bother with stem nuts on road wheels but I do use them on mtb wheels as the tube can slowly rotate within the tire as you ride and somewhat pull the valve stem pointing it to one side.
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Old 03-09-09, 12:52 PM
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Originally Posted by roadfix View Post
I don't bother with stem nuts on road wheels but I do use them on mtb wheels as the tube can slowly rotate within the tire as you ride and somewhat pull the valve stem pointing it to one side.
That's a sign of under-inflation.
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Old 03-09-09, 01:13 PM
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I think this is what you need.
http://www.nashbar.com/bikes/Product...200394__200394
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Old 03-09-09, 01:22 PM
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Originally Posted by Al1943 View Post
That's a sign of under-inflation.
I intentionally under-inflate fat tires under certain riding conditions.
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Old 03-09-09, 02:19 PM
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Originally Posted by sunburst View Post
I'm asking because I've had multiple failures with tubes at the base of the valve (where it connects to the tube),
Just get a rat-tail file, and bevel out the holes in your rims so they don't present sharp edges to your valve stems. Its probably just a sharp burr thats been scratching them up.
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Old 03-09-09, 02:25 PM
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Originally Posted by xenologer View Post
just get a rat-tail file, and bevel out the holes in your rims so they don't present sharp edges to your valve stems. Its probably just a sharp burr thats been scratching them up.
+1
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Old 03-09-09, 07:19 PM
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Originally Posted by DiabloScott View Post
Michelins aren't even threaded for a nut.


You just have to push down on the tire to poke the valve out until you get the pump head on. Probably more difficult with some kinds of tires and some kinds of pumps. I never use a nut on any of my bikes.

Back to OP - I've had prestas in my schrader rims for years and I think only once has a tube failed there. I tried the grommet thingies at first... found them hard to deal with and unnecessary. I'm just a little extra careful not to wiggle it when I remove the chuck.
I have this type of stem also (on my fancy Ksyrium wheels) - that's why I mentioned threaded stems and nuts. At any rate, after all these responses, I feel sufficiently emboldened to stick my presta into a schrader hole.
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Old 03-09-09, 08:00 PM
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I use aluminum presta adapters, but I grind them down until they're level with the rim, epoxy them in place and then hide them with the stem nut.
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