tyre valve.

A question about : tyre valve.

Am I doing something wrong or do I need a new pump?

Got a flat on the way home, 1 inch nail change went smoothly until I came to pump the trye, the pump is a lezyne tech drive, good pump but I have to screw the tube on as it seems not to be able to be pushed on, which is good as it stays put, but the problem comes when trying to remove it,as it unscrews the inner tube valve too (presta),so all the air comes out, is it me or the pump?

Best answers:

• I don't know, but one of these will get you home and work very reliably:
  https://www.amazon.co.uk/gp/product//...?ie=UTF8&psc=1
• cheers, I googled it and it seems some inner tubes have removable valve cores some don't, they tend to be loose when new, add to that the pump I have has a screw fitting, hence the problem...seems my options are buy a different pump, buy different inners or buy or one of these https://www.wiggle.co.uk/lifeline-val...sku=5360644907
  I took the last option as it's the cheapest, and I like my pump and continental inners.
• I had this problems once on the way to work.
  once it was loose i couldn't tighten it anough to stay on when i unscrewed the pump, as it would always unscrew the valve before the pump.
  i ended up just going to the local halfords to get a new inner tube
• Punctures in modern motor vehicle tyres are practically unheard of, and there is never any problem with different types of valve and/or different types of pump.
  When I bought my current bike about 5 years ago, it was an end-of-season reduction from around Ј800 to around Ј250, and the bike came complete with Continental Sport tyres (which were said to be as good as puncture-proof) and included the manufacturer's offer of a replacement cover if the tyre should ever be punctured.
  I don't do many miles, but most of them are on cycle paths and tow paths. I had three punctures in the first couple of years, and because the bike has hub brakes and hub gears, a roadside repair is an extremely unattractive proposition.
  Cyclists frequently complain about their lowly place in the road users' pecking order, but the thing which most deters me from more adventurous bike rides is the risk of getting a puncture.
  No doubt there is some kind of trade-off between rolling resistance and puncture resistance, but the motor industry (including motor bikes) seems to have found an acceptable compromise - why are bicycle tyre punctures still such a problem?
• 5 minutes to fix a puncture? Wished I were that quick, seem to be around 10 minutes myself (though do have to mess about removing the rear wheel being a hub gear with no derailleur).
  So far I have suffered three punctures. All whilst using Continental Gatorskin Ultra tyres (puncture resistant).
  Don't have any inners with removable valves but can't say I have had any problems using my Topeak Road Morph (with gauge) pump. Normally have it strapped to the bike's downtube.