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Old 08-16-06, 02:39 PM   #1
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Square Pegs/Round Holes: A Little Presta and Schrader Interaction

Hypothetical: I'm on the trail and I come upon this REALLY cute cycle gal. . .nice outfit. . .nice ride. . .pretty much all a 50+ could ask. Stunning, really. She's got a flat and no spare. Boyfriend has sallied forth to fetch the SUV and will arrive at a close by bailout at some time undefined for a rescue. [Boyfriend had no spare either, but that's another story my children.] She needs 26" Schrader; I've got 26" Presta. Fortunately [for her, alas], Sir White Knight is on his way so it's really moot. A Schrader-tube-to-Presta-rim won't work because of the too-tiny hole. Would a Presta-tube-to-Scrader-rim work. . .at least temporarily?

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Old 08-16-06, 02:49 PM   #2
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it might, but I wouldn't trust it. You'd have to have one of the little nuts to keep it centered, because if it got off at all, you'd run out of the reinforced valve rubber, and the tube would bulge out through the hole.
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Old 08-16-06, 03:18 PM   #3
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A presta valve tube would probably puncture at the valve. You might be able to limp home on low pressure. It also might work if you put the hand-threaded nut on the presta valve first. It will certainly work if you use a Schrader-Presta adapter bushing. My MTB and touring bike rims are drilled for Schrader but I use Presta with some of these adapters.
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Old 08-16-06, 03:20 PM   #4
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This just reminded me.. I need to pick up an adapter bushing before our tour next week... my bike is Schrader but the GF uses Presta.
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Old 08-16-06, 03:32 PM   #5
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Yes. Take the old tube, cut about a 1 inch square from it, poke the presta valve through center of the square, install tube. Don't pump up very high, limp home.
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Old 08-16-06, 07:26 PM   #6
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I have used prestavalves in schrader rims (with out the adapters) I actually ran a pair of these for over a year on my wife's hybrid until I got the adapters . There might be a chance if you ran really high pressures but at 60 psi they did fine. I switched to presta's on her bike so I wouldn't have to switch the pump head on rides.
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Old 08-16-06, 07:30 PM   #7
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Quote:
Originally Posted by lmzimmer
I have used prestavalves in schrader rims (with out the adapters) I actually ran a pair of these for over a year on my wife's hybrid until I got the adapters . There might be a chance if you ran really high pressures but at 60 psi they did fine. I switched to presta's on her bike so I wouldn't have to switch the pump head on rides.
+1

Presta valves work pretty much fine in Schrader rims... you could certainly run into problems with high pressures causing the tube to bulge out, but I did it for about a month of daily commuting with no ill effects.

Then I bought these $2 adapters: http://www.nashbar.com/profile.cfm?c...eid=&pagename=
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Old 08-16-06, 08:56 PM   #8
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It works absolutely fine. Just use the little nut and make sure the valve is straight.
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Old 08-16-06, 09:30 PM   #9
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Works fine, at least at mtb pressures. Keep in mind the tube has thicker material at the base of the valve stem where it's attached. The semi-permanent fix that works on most rims, if you want to convert schraeder rims to presta, is to use the little press-in rubber grommets (my favorites), or the small aluminum inserts. So if you want to be a real hero to the lady, carry a couple of extra grommets in your saddle bag, and convert her rim for her before you install the new tube.......somehow that sounds obscene.
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Old 08-17-06, 08:05 AM   #10
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Quote:
Originally Posted by lmzimmer
I have used prestavalves in schrader rims (with out the adapters) I actually ran a pair of these for over a year on my wife's hybrid until I got the adapters . There might be a chance if you ran really high pressures but at 60 psi they did fine. I switched to presta's on her bike so I wouldn't have to switch the pump head on rides.
+1

I have been running a set of tires on one of mine at 80-100psi for about 2 years without the donuts (same tubes, no flats). I buy the donuts but by the time I get around to wanting to put them on they have rolled off to oblivion.
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Old 08-17-06, 08:42 AM   #11
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Yeah Presta-tube-in-Shrader-hole works just fine. In the 26"/MTB scenario you describe you are not going to get into the high-pressure zone. I've been running a MTB/Hybrid setup like this for years with no problems at all. Ditch the little "nuts" that screw onto the Presta stems, too...they won't "keep the stem centered", and if you over-tighten them in an attempt to do so you will damage the rubber at the base. The grommets, ok, might not hurt, especially if the rim hole is damaged or has burrs or something but that would be a problem for Shrader anyway. I've never used the grommets. Just let it dangle
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Old 08-17-06, 08:51 AM   #12
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Quote:
Originally Posted by San Rensho
Yes. Take the old tube, cut about a 1 inch square from it, poke the presta valve through center of the square, install tube. Don't pump up very high, limp home.
The rubber shim is a good idea. A presta tube in a shraeder hole is generally no problem, even at full pressure. I have installed them on shraeder rims numerous times on group mountain rides with no ill effect. The sshim on a road tube would be definitely a good idea, with the higher pressure.
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Old 08-18-06, 12:38 PM   #13
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This is no case for resort to a time consuming BF inquiry, man. You must take action. After all, what have you to lose? Take the tire, fill it w/ dried leaves and dirt, if you have to. Help this poor damsel who needs her hero. Time's a-wastin.
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Old 08-19-06, 01:48 AM   #14
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duck tape around where the valve meets the tube and the rim hole to prevent punture air and go temporary fix only
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Old 08-19-06, 04:55 AM   #15
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I don't like Presta valves. I will take a Schraeder any day. No unscrewing the valve, tapping it, etc. My LBS guy says Prestas hold the air in better, but I still like Schraeders because they are easier to inflate. Particularly because I use an air compressor, so with a Presta I have to put on an adaptor, which is another pain.
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Old 08-19-06, 08:10 AM   #16
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Quote:
Originally Posted by trmcgeehan
I don't like Presta valves. I will take a Schraeder any day. No unscrewing the valve, tapping it, etc. My LBS guy says Prestas hold the air in better, but I still like Schraeders because they are easier to inflate. Particularly because I use an air compressor, so with a Presta I have to put on an adaptor, which is another pain.
Can't say that I agree. I prefer the Prestas, particularly as I can deflate them in seconds if nessesary. I've had to do so on more then one occasion where I found a tire bead just about ready to blow off the rim.

While I don't know whether it is fact or not, from what I've seen, it does appear as if the Prestas deflate slower then the Schraders. Additionally, I've yet to have a Presta valve fail to close properly, but I've had Schraders that leak.

I never run with adapters - my floor pump has a dual-head, and my frame pumps are set up for Presta.

Take care,

-Kurt
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Old 08-19-06, 08:13 AM   #17
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Quote:
Originally Posted by trmcgeehan
I don't like Presta valves. I will take a Schraeder any day. No unscrewing the valve, tapping it, etc. My LBS guy says Prestas hold the air in better, but I still like Schraeders because they are easier to inflate. Particularly because I use an air compressor, so with a Presta I have to put on an adaptor, which is another pain.
I agree that Schraeders are nearly always more practical!!

However, the snob in me can't bear to use Schraeders. Prestas are just very high-zoot, and I think look cooler Also, a while ago there was a thread where people were arguing viciously about what was easier to pump up, Retro Grouch insisted there was no difference... I eventually *tried* it with a hand pump, and figured out that Schraeders were actually slightly easier to pump up with a hand pump.
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Old 08-19-06, 03:50 PM   #18
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Originally Posted by moxfyre
I agree that Schraeders are nearly always more practical!!

However, the snob in me can't bear to use Schraeders. Prestas are just very high-zoot, and I think look cooler Also, a while ago there was a thread where people were arguing viciously about what was easier to pump up, Retro Grouch insisted there was no difference... I eventually *tried* it with a hand pump, and figured out that Schraeders were actually slightly easier to pump up with a hand pump.
+1
especially with cheeper pumps..
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Old 08-19-06, 05:49 PM   #19
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Ran a presta in my schreader rear wheel at 90 psi for about 2 weeks before died, cut at the edge of the valve. Picked up a rubber donut on the way home and it has been fine ever since.
I first installed my tube without any protection from the spoke holes (late night tire(d) change) that lasted about 2 days before I flatted out. Velotaped the rim when I got home, problem solved.

Lesson learned: keep tubes away from sharp edges or anything they might begin to squeeze though.
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Old 08-19-06, 05:58 PM   #20
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In my younger, less informed days, i ran a presta tube in a schreader rim for several weeks at 110psi. Didn't cause any problems. Eventually, someone pointed out my error and I got the adapters.
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