Presta valves

[The univega]

I am not used to presta valves and today I had to fix a puncture with a presta valve. I knew I had to unscrew the top part to allow for inflation. The valve did not seem to be very long and every time I inflated the tyre when removing my Pump the valve came out with the pump.This happened about 20 times till I eventually got lucky.Does anyone know why this would happen?

 

[david k]

i cannot work them out either, broke one trying to pump it up, scared to pump them up now!

 

[screenman]

I am not sure how you managed that unless you have valve extensions on, you only need to loosen the knurled nut a few threads and give it a slight press to break the seal.

 

[GrasB]

Annoying thing I've noticed with recent tubes with removable cores is that the valve is barely more than finger tight in tube (I assume this has something to do with deeper section wheels becoming cheaper & cheaper so valve core extension tubes are being used much more. Anyway buy your self a valve wrench (they cost £1.99 from my LBS) & nip the valves tight every time you pull the tube out of its box.

 

[The univega]

I have not heard of a valve wrench, what does it do?

 

[GrasB]

It simply locks into the flats of the valve core, you then use the end to tighten the core down.

http://www.chainreactioncycles.com/Models.aspx?ModelID=45247

 

[Maylian]

Never had an issue with presta and as weird as it may sound much prefer them to schraeder valves.

 

[GrasB]

The only issue I've had recently is valve cores supplied 'lose' from the factory.

 

[The univega]

That's me ordered some valve wrenches hope they do the trick thanks.

 

[Deleted member 1258]

The only issue I've had recently is valve cores supplied 'lose' from the factory.

I've come across this as well, the valve core hasn't been tightened correctly in the factory and when you try to unscrew the knurled nut the entire valve comes out, in the past I've just screwed it back in and tightened it down with pliers. It sounds like this could have been the OP's problem.

 

[Muddyfox]

The only issue I've had recently is valve cores supplied 'lose' from the factory.

I've had this recently with Continental tubes

 

[Cyclist33]

I bloody hate them! No more reliable than any other system and easy to snap. Stupid invention of the millennium.

Stu

 

[Deleted member 1258]

I've had this recently with Continental tubes

I seem to remember a thread on here some time ago about a batch of faulty tubes, presta valves loose, I have an idea they were Continental tubes.

 

[screenman]

Cyclist33, I have used them since the beginning of time and never snapped one, maybe it is you being a bit no a lot heavy handed.

 

[Cubist]

I've had this recently with Continental tubes

Yep, me too, not just recently but about two years ago. Bloody Germans.

Top Spamming Zibiwenga old luv.