Presta valves have a tendency of sticking. Unscrew the lock nut, tap the end of the valve with your finger until you hear the air come out. Install the pump head and pump away. Presta valves use air pressure to keep the stem in a closed position. If the pressure is greater in the tube compared to outside pressure the valve stem wont move.
I think you are missing one step: After you get the cap off, unscrew the top part of the valve, then tap on that loose part to let just a poof of air out. If you don't do that then the valve stays pretty much closed down inside. Once you do the tap, then attach the pump & fill the tires.
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I feel a bit silly having to ask this. Question for those of you who are used to presta valves. Is there a trick to inflating a tire with the presta valve? What I have been doing is unscrewing the little piece at the end of the stem all the way open, then I attach my pump (made for presta valves), close the handle to lock the pump, but I always have trouble filling the tire, like the air is having a difficult time getting past the valve and into the tube. Is there something obvious I'm overlooking?
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