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faulty presta valve

Old 10-13-15, 05:03 AM
  #1  
avidone1
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faulty presta valve

Can the valve be replaced or do I need a new tube?
When I screw down the thingie on the valve to allow pumping, the slightest touch on the side of the valve will release air from the tire.
So when I put my pump chuck on the valve air is released and it takes a bit of doing to hold it perfectly straight up so i can pump air into it.
I tightened the ring on the bottom but that doesn't help. The front valve is fine. I screw down the thingie give the valve a tap on top to burp it
attach the pump and fill it up with no problems.
The bike is only three months old. Would this be a warranty issue or will I have to pay for the repair?
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Old 10-13-15, 05:46 AM
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You probably bent the little stem on the presta valve. Not a warranty item. When that happens, unless it's real bad, I just live with it. The alternative is to replace the tube which is about a $5.00 item.
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Old 10-13-15, 06:46 AM
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Might be $10.00 if they have to change the tube for you. Some presta valves do have removable cores but it is easier to just replace the tube.
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Old 10-13-15, 07:14 AM
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I wonder........would a shrader valve adapter work? HMMMMMMMMMM....I have a couple, may give it a try
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Old 10-13-15, 08:52 AM
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You still have to unscrew the adapter twice,. 1 to burp the P/V valve,. then screw it on again, use S/V pump

then 2 take the adapter off and close the check valve securing nut.
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Old 10-13-15, 12:52 PM
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went to lbs with bike and yes, the inner stem is a little bent, but no big deal. He showed me that if I pump the tire with the valve positioned at the top, the pump chuck will hang straight down and there is no problem. I tried it a couple of times just to make sure and it was the fix. It's those little bits of knowledge that are priceless.
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Old 10-13-15, 01:54 PM
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Do yourself a favor. Go onto You Tube, and do a search for the several videos that take you step by step through basic bike maintenance. There are a few on changing a tube. All it takes is a little practice at home, and you'll save money and time. Sooner or later, you're going to get a flat on a ride, and knowing how to replace the tube it and get back on your ride is important. Otherwise, you'll have either the call of shame, or the walk of shame.
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Old 10-13-15, 05:32 PM
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Originally Posted by avidone1 View Post
went to lbs with bike and yes, the inner stem is a little bent, but no big deal. He showed me that if I pump the tire with the valve positioned at the top, the pump chuck will hang straight down and there is no problem. I tried it a couple of times just to make sure and it was the fix. It's those little bits of knowledge that are priceless.
Well now, that's interesting. I've always intuitively done it that way but never actually thought through the mechanics. Also, wrt replaceable/replacement presta valves, I have a handful of valves pulled from old tubes.
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