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Deflated tube - no hole

Old 06-21-06, 08:24 AM
  #1  
nicksmaint
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Deflated tube - no hole

I just had some new tires and tubes put on my bike. After a few rides the tires needed a little inflating, so I inflated them within the recommended pressure range.

A few days later, when I had a chance to ride again, I noticed one of the tires almost flat. Thinking I must have punctured it, I immediately changed the tube. I later inflated the tube and checked for a leak in water, but found none. I left it somewhat inflated for a few more days and it seems to be holding air.

The tube has a presta valve. Now I am wondering if it is possible that when I inflated them awhile back, could it have been possible that I did not tighten the lock nut on the presta valve all the way. I plan on putting the tube back in the front tire to see if will hold air - but thought I would check to see if anyone has had a similiar experience with presta valves.

TIA.

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Old 06-21-06, 08:49 AM
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I've had a problem with presta valves. Either I tightened the nut too hard, or the valve just wasn't up to scratch. The whole valve had pulled a little loose from the tube. Never had a leaky valve though...
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Old 06-21-06, 09:24 AM
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The nut on a presta valve actually does not have to be tightened down for the tube to hold air. Notice that once unscrewed you have to press it in to let air out, and you have to have enough extra air preasure on the outside to push it in for air to flow in to the tube. (That is why you can have trouble inflating a prest tube if the valve is sticking).

In your case I would guess there might have beeen a grain of dust in the valve originally and that somewhere along the line it got flushed out.
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Old 06-21-06, 09:47 AM
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Try submerging the tube in water to see where's the leak.
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Old 06-21-06, 08:15 PM
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I hate Presta valves with a passion uncontested. I've had the same problem, and I did inflate it and dunk it in water. No leak. The last time I ran into this situation, I had just brought the pressure from 60 up to 80psi. Then loaded it on the rack, drove 2 miles, and jumped on the bike. Flatter than a fritter.

As Keith99 says, it may have just been a grain of dust. My personal opinion is that quality control in Presta valves is somewhat variable. Next time I have a flat, I'm putting that old tube back in. I won't be at all surprised to see it hold air the next time. For what it's worth, I use Presta to Schrader adaptors, and that may be part of the problem. Anyway, I'm interested in the discussion.
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Old 06-21-06, 09:36 PM
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Same thing happened to me few days back, I was unlocking the bike from the bike rack on campus. I notice the rear was dead flat.

I didn't find any punctures, I thought it was some sort of a pinch flat. Took out the tube, found out the valve(presta) ripped out of the tube. It turns out that I over tighten the nut, not giving it room to expand (it was really hot that day and the bike rack was outside).
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Old 06-21-06, 10:43 PM
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I don't suppose I mentioned how I hate presta valves?
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Old 06-22-06, 07:59 PM
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I know this is a silly suggestion but check your old punctured tubes too - I thought I didn't have any thing stuck between my tire and tube but when I double-checked the locations of the punctures on the tube I found they were on the same spot. This helped me find the tip of a tiny rusty staple and fix the puncture.
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Old 06-27-06, 12:33 PM
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Well from the looks of it, I am not the only person to have a problem like this. I have checked the tube several more times and it remains inflated hanging from the hook I put it on. The tube that I put in the tire to replace it has been fine thru about 5 more rides, so I am guessing that the tire does not have anything stuck in it. So this weekend the "troubled tube" will go into the front tire and I will see if it stay inflated.

Thanks everyone for the feedback.

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Old 06-27-06, 12:42 PM
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I bet it will.
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Old 06-27-06, 01:20 PM
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I've had this happen. Tire was completely flat after the overnight. Took out the tube, pumped it up and there was no hole. Put it back in the tire and it lasted a long time.

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Old 07-04-06, 01:57 PM
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It happened again, today. I routinely brought a tire up to pressure, and in two minutes, more or less, it was flatter than a fritter. I pumped it up again. It held for 30 minutes. I took it for an eight mile ride on rocky road, and it's just fine.

Presta valves! They might as well set the tubes up for an inflator pin like a football.
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Old 07-04-06, 02:10 PM
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Originally Posted by Nermal
I don't suppose I mentioned how I hate presta valves?
I'm not sure...let me think...yup you did.

I do have good luck with them. I buy ones that are smooth not the ones that are threaded. My pump seals too tight and I have pulled a valve out cause the threads bind on the pump.

I did loose pressure once for what I thought was no reason. What it ended up being was I didn't screw down the valve and put a cap on it and the cap just pushed enough to act as a slow leak.
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Old 07-04-06, 03:20 PM
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Well, I haven't had much in the way of problems with the presta valves, but concerning your failure to find a hole and for the moment assuming the problem wasn't something in the valve causing it to not seal properly before, I've had a couple holes in tubes that were very hard to find.

I had to pump the tube way up, much more than I normally would to find a leak. Then I had to put it in water. Even then, as I rotated the tire through the water, I had to keep squeezing the tube to put more pressure in the area under the water to find the leak. It was so small that you would get one tiny little bubble every 1-2 seconds! In such a case, I wouldn't be surprised if you could pump it up a little and let it sit for a long time without it leaking or doing so so slowly that you almost can't tell.
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