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This is the third time that I've had a leaking Presta valve on the tube. There must be a way of repairing the Presta valve rather than having to discard a good tube. Someone did it by applying glue, but I didn't watch closely enough to see where he put the glue. What can I do?

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Please clarify something for me. Are you getting leaks from the top of the valve itself or from the base, where the stem meets the rubber tube? –  DC_CARR Dec 16 '10 at 20:06
I think there must have been a worldwide change in the technology used recently, since all of a sudden I too have been having the values come off from the tube. I rarely get punctures now, 80% of my throwaways are because of values detaching - Vittoria & Specialized being the brands I have had trouble with –  Anthony K Dec 17 '10 at 4:36
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1 Answer

You could try rubber cement however, you will probably still have a slow leak.

You best solution is to prevent the valve from separating from the tube. To do this, I don't put the retaining nut on until after I have fully inflated the tire. Once the tire is inflated, I screw the nut on just tight enough that it won't fall off. You could add some loc-tite but I don't and haven't had a problem. If you over tighten the nut, you are going to cause the valve to separate from the tube.

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Additionally applying a light coating of baby powder to the tube will prevent the tube from sticking to the tire. If the tube is sticking to the tire anytime the tire slips on the rim (like when you are applying the breaks hard) the tire will pull on the tube which in turn pulls on the valve. Which if it happens enough will put a whole in your tire near the bottom of the valve. –  Ben Dec 17 '10 at 22:54
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