To day I got a flat tire (26" mtb) (a little metal-"needle"-thingie).. no problem i thought, I have Lezyne-patches and and a spare-tube.
The tube was new (Conti DV MTB 26, 47/62-559, 26x1.75-2.) since i got a flat one last week, and mye sparetube was also bad...
So to the problem.

I have a Lezyne pump, and it has never been any problem. I have got flat-one maybe 6-7 times last 6 years or so since i got that pump. Today when i was screwing out the pump-hose... the inside of the valve followed with it.
I thought it was something with that tube, so i got the new sparetube, and smae thing there. So i hade to take the last 20 km or so with the pumphose instead of the cap... and that worked fine. It's presa/racing-valve)

Is continental that bad? Or am I an idiot.

Some presta tubes have replaceable valve cores, but screw on presta pump hoses should not engage the core in such a way as to remove it. I would suggest you try tightening the core securely to the base of the valve before use.

Are you saying the "presta valve locknut" screws in while your screwing on the pump head there by closing the valve not allowing it to except air?

aaaask a bike shop... they can see what you cannot describe...

there are fixed and replaceable core presta tubes, all schrader tubes have replaceable cores.





....

I fixed it. I used a piler to tighten it.
As I said, I have been using the Lezyne-pump on presta valves for many years, and this is the first time this has happend. When i had a flat tire last week, noe problem.. but that was with a Kenda-tube.
Sp maybe Conti-tubes need to be thightend before use.

You are an idiot.
First thing to do with Conti tubes....they have removable valve cores..... is to tighten the valve core so this will not happen on the road. Prep your kit.
I do not like pumps and hoses that need to screw onto the valve in order to inflate tube.

Well, this is a national bike forum also, and I did give you advice above to tighten the valve. It may have been a batch of Conti's that were not tightened properly. Finally, your posts would be easier to read if you did a little bit of proofreading.

On the road with a handpump, i think its easier to pump with a hose on the valve, rather than hold the pump streight in. Its easy to bend the valve when (i think) when you put the pump right on the valve (manby beacuse i am i an idiot)

I'm sorry to bother you. And sorry for my poor english,

On the road... easier to pump tire with wheel off the bike after fixing the flat. No hose needed. Hose is one more murphy to go wrong.

Off course i take the wheel of.
I had a couple of incidensts with "valve-bending" when i moved to presta-valves.. therfore lezyne with hose.
And it has never been a problem, and now thta that now to thightend it... thre wil be noe more problems.. and as a backup, as I did to today.. the hose was locked on the valve.

Thanks anyway for all the ansewrs and input. It means a lot to me to get more knowlege on bike-things.

This is an INTERNATIONAL bike forum and English may not be a person's primary language.

No need to apologize. It's not your fault that people may have forgotten that not everyone is perfect with the English language.

I specifically referred to proofreading and not to grammar. English has nothing to do with typos such as mye, smae and presa. As one types a post the misspellings that are not automatically corrected are flagged with a red line underneath. A simple right-click indicates possible fixes.

It is not your English that I am referring to, but rather the numerous typing errors that were not corrected, such as smae, presa, thta, sp, etc.

What a way to welcome a new member though

not evereewon iz az purrfekt in spehleeng az yu r.

If you want to continue on about grammar how about you start a new thread in Foo? There's a person with dyslexia and other disabilities in there that you can pick on. But somehow everyone in there just rolls with it and accepts him as who he is.

If, perhaps, he is using a Norwegian language system, just about everything he tries to write in English will be flagged as a misspelling, and the suggested replacements will be Norwegian words, so not much help there.

Good job. Don't worry, many of us learned this lesson the hard way just like you. I'm diligent now about tightening the value core before installing a new tube.

Also ignore the. 'idiot' and spelling comments. Some people have no manners, just know not everyone here is like that.

Maybe a dab of some lube on the pump hose connector. I'm not quite sure what I'd use, but probably whatever was available at the time. Perhaps a drop of grease, or viscous oil. Not too much as you don't want to fill the tube, but a couple of drops should be fine.

I usually use a drop of spit which I almost always have readily available.

That would work.

I was going to suggest nose oil... which is an old fishing trick, and also always available.

I should not have bothered answering the posts that explained all the reasons I should not have said anything. Perhaps the critics who ask me to assume the best could assume that I meant no harm. To remind you all, I merely said the posts would be easier to read. I did not say it upset me or that s/he was less of a person. I could just as well criticize others for assuming the poster is male, even though I assume they had no sexist agenda.

I suggest this. If a post is too much trouble for you to read, skip it. There are others who don't have your hangups that will help.

I tend to favor speed over accuracy on discussion boards. I save my super ninja spelling/grammar skills for work related documents, job applications, appealing restraining orders. Important stuff like that.

I suggest that if you don't know the difference between an observation and a criticism that you keep your criticism to yourself. I tend to favor clarity over speed on discussion boards -as the point is discussion, not getting one's point in quicker. With that I'll say goodbye to this thread.

Finito00,

I’ve also had this problem with Lenyne floor and hand pumps. As others mentioned, it’s easy on some tubes to take out the valve core when unscrewing the head from the tube. The solution is tighten the cores in new tubes with pliers in advance.