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Tire valve thing broke off. Can I ride anyway?

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Tire valve thing broke off. Can I ride anyway?

Old 06-28-08, 06:03 AM
  #1  
kayandallie
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Tire valve thing broke off. Can I ride anyway?

Hi, I was pumping up my tires (the skinny valved kinds) and the little screw in thing that you unscrew when you are going to pump up the tires broke off. My tire seems nicely inflated. Can I ride on it without that thing in there? (I'll take it to the shop another day, when I have time).
Thanks
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Old 06-28-08, 06:09 AM
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The tube should hold it's air ok since the inner seal is also held closed by the internal pressure. but, without the lock nut, hitting a sharp bump could allow some air to escape. I'd replace the tube as soon as possible.
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Old 06-28-08, 06:12 AM
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kayandallie
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Thanks!
I'm off to go ride, then! I'll take it to the shop this very afternoon.
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Old 06-28-08, 06:27 AM
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spend $5.00 and carry a spare tube.
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Old 06-28-08, 06:35 AM
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Originally Posted by kayandallie View Post
Thanks!
I'm off to go ride, then! I'll take it to the shop this very afternoon.
You should ride it to the shop, not ride it to a ride.
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Old 06-28-08, 06:48 PM
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Originally Posted by HillRider View Post
The tube should hold it's air ok since the inner seal is also held closed by the internal pressure. but, without the lock nut, hitting a sharp bump could allow some air to escape. I'd replace the tube as soon as possible.
Couldn't happen. The internal pressure will hold the valve closed. The force from a bump would not be enough to open a valve that is being held in place by around 100 psi of back pressure. As soon as you try to put air in it, the valve will be gone. But up to that point it will hold air.
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Old 06-28-08, 06:52 PM
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cyccommute is correct.

It will hold air, will not loose air on a bump as stated, unless you puncture.
But, when you want to add air . . .Pfffft . . all the air will come out.
Been there, done that.
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Old 06-28-08, 07:07 PM
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Originally Posted by cyccommute View Post
Couldn't happen. The internal pressure will hold the valve closed. The force from a bump would not be enough to open a valve that is being held in place by around 100 psi of back pressure. As soon as you try to put air in it, the valve will be gone. But up to that point it will hold air.
Of course there is 100psi of back pressure. When you pump it up, there IS more than 100psi produced by the pump. But remember, psi is pounds per square INCHES. The valve is much smaller than 1 in^2.
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Old 06-29-08, 07:47 AM
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Originally Posted by Tabor View Post
Of course there is 100psi of back pressure. When you pump it up, there IS more than 100psi produced by the pump. But remember, psi is pounds per square INCHES. The valve is much smaller than 1 in^2.
Cyccocommute is correct that the valve stem is so light that any reasonable bump isn't likely to unseat it. Your are right the force on the valve seat is not 100 pounds, it's 100*area. However, it's plenty to keep it seated unless the hit is extraordinary.
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Old 06-29-08, 07:55 AM
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I did ride on it without worry.
And, I am going to make an attempt to change the tube myself (figuring that this is a good time to learn, as I'm not on the side of the road in a panic, as well as, if I can't do it then I can take it to the shop). FWIW, the closest bike shop is 30+ miles away, and to ride to it would take me through some very undesireable sections of the city. Think I would rather drive.
Thanks for the help!
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Old 06-29-08, 07:59 AM
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The valve type is called Presta, btw

I can't see it allowing air to escape, the bump you'd have to hit to unseat it would present concerns greater than air escaping the tire. There should also be no problem adding air as your pump will overcome the pressure in the tire. As far as I know that little locky screw thingy enables you to allow air to escape and not to actually prevent it... or to prevent air escaping but only at very low pressures, as when your installing a tire.
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Old 06-29-08, 10:10 AM
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The other day I rode a century with the valve unscrewed on my rear wheel and never lost any air. I never even noticed until I got the bike out of the car a day or 2 later.
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Old 06-29-08, 10:23 AM
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Originally Posted by HillRider View Post
However, it's plenty to keep it seated unless the hit is extraordinary.
I wasn't trying to argue with this point. For the record, I concur. I still would get a new tube ASAP. If you managed to break part of the stem, you could have damaged some other parts.
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Old 06-29-08, 11:06 AM
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I had a damaged valve once when I was really short on cash. After pumping it up I put the little black plastic valve cover back on. I went for a couple of months before buying a new tube. You have to be John Howard to go fast enough for centrifugal force to depress the spring in the valve, letting the air out.
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Old 06-29-08, 12:11 PM
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Somebody's gotta say it: every bicyclist should have at least one or two spare tubes on hand.

And OP: you don't need to go to a "good" bike shop to get a tube, just go to the nearest one that sells presta valve tubes. They are commodities.
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