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  FORUM:   General Team Discussion Forum
TOPIC:   Presta Valves 


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BLJORDAN
BLJORDAN's Photo Posts: 58
8/10/11 8:36 P

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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.



STRAPPED_182
STRAPPED_182's Photo Posts: 213
8/10/11 3:07 P

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Spend a dollar on the schrader valve adapter, and use a compressor and gauge.


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BILL60
BILL60's Photo Posts: 169,200
8/10/11 8:57 A

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What would I do? Take it to my local bike shop and have them watch as I attempt to fill the tire with air. They will point out what is not going right.

"Excellence is but for the few."


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YELNEP
YELNEP's Photo SparkPoints: (2,061)
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8/10/11 1:43 A

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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.

The thrill is not just in the winning, but in the courage to join the race


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TOPAHI
TOPAHI's Photo SparkPoints: (14,026)
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8/9/11 11:27 P

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Couple of things to try.

Make sure the pump head is pushed down all the way on the valve. The head can lock onto the stem without it being fully inserted, but won't let the air in.

You can also try and not unscrew the valve all the way. Unscrew it to the end then turn it back a half turn or so.

Make sure you can push the valve in without using the pump. If the tire is empty of air you should be able to blow some air in it with your mouth.

Good luck and let us know what worked.



Tom

Riding a bike is FUN!
The treadmill is NOT!

Never argue with idiots... They will drag you down to their level and beat you with experience.


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EBUCK007
EBUCK007's Photo SparkPoints: (2,845)
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8/9/11 10:01 P

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That may be my best bet.


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4A-HEALTHY-BMI
4A-HEALTHY-BMI's Photo Posts: 5,852
8/9/11 9:57 P

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Sounds like you're doing it right.

Can you take it to the local shop or ask a cycling friend in person to look at it?

Never, ever, EVER give up!

From BMI 53 (336 lbs) to under 30. Now aiming for less than 20% body fat.

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Goal 155 +/- 3%


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EBUCK007
EBUCK007's Photo SparkPoints: (2,845)
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8/9/11 9:42 P

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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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