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Presta valve unscrewey thingy...

UndercoverElephantUndercoverElephant Posts: 5,796
edited January 2010 in Commuting chat
Sorry to get technical in the title...

Yesterday morning I was going to pump up my tyres, and it being morning I wasn't at my best. Anyway, I unscrewed the screwy-inny bit from the valve and it fell out and got lost through a wormhole in my garage and is currently living life as a mushroom in another dimension.

Anyway, the tyre still seems to have air in it, so does it make a difference if I haven't got that bit at all?

Posts

  • Clever PunClever Pun Posts: 6,778
    as long as the little bit of metal it screws on to doesn't move you should be ok... you got a dust cap on right?
    Purveyor of sonic doom

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  • deswellerdesweller Posts: 5,175
    It retains the seat when there's not air pressure to keep the valve seated.

    As long as there's air in the tyre it will be OK (as the air pressure will keep it in place) but as soon as you get a puncture it will fall into the tube and be lost.
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  • biondinobiondino Posts: 5,990
    Not that it matters unless you're one of these wicker-man-burning types who actually *repairs* a punctured inner tube...
  • Wallace1492Wallace1492 Posts: 3,707
    I have buggered up a few of them with my pump.... but, hell, as long as they stay inflated and you have contingency...
    "Encyclopaedia is a fetish for very small bicycles"
  • tailwindhometailwindhome Posts: 17,371
    Presta valves are the devil

    FACT
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    Is reachable from here.
    Believe in miracles
    And cures and healing wells
  • itboffinitboffin Posts: 20,034
    biondino wrote:
    Not that it matters unless you're one of these wicker-man-burning types who actually *repairs* a punctured inner tube...

    Oi i'm watching you

    I can't afford to keep buying tubes it's costing me 5 a month on avg.
    Rule #5 // Harden The censored Up.
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  • Thanks chaps, my mind is at ease. Sounds like I can't inflate it any more though, which is a shame. I do have a load of spare inners at work, and carry a couple in my seat pack, so no real worries. Might get an itch to fix it at some point, but not just yet.
  • deswellerdesweller Posts: 5,175
    biondino wrote:
    Not that it matters unless you're one of these wicker-man-burning types who actually *repairs* a punctured inner tube...

    Tube-repairers would never burn wicker-men. Too much CO2.
    - - - - - - - - - -
    On Strava.{/url}
  • prj45prj45 Posts: 2,208
    Thanks chaps, my mind is at ease. Sounds like I can't inflate it any more though

    Er, yes you can.

    I think.

    Or maybe you can't.

    Pretty sure you can though.
  • Thanks chaps, my mind is at ease. Sounds like I can't inflate it any more though, which is a shame. I do have a load of spare inners at work, and carry a couple in my seat pack, so no real worries. Might get an itch to fix it at some point, but not just yet.

    You might manage to reinflate it - it's a matter of where it goes if you get another puncture. I repaired a tube without the screw part a while ago, then had another puncture and managed to repair it and reinflate it a few times. But I only managed to repair one puncture. During the second post-valve puncture, it dislodged itself. The tube is now in a bin in Telegraph Hill Park.
  • always_tyredalways_tyred Posts: 4,965
    prj45 wrote:
    Thanks chaps, my mind is at ease. Sounds like I can't inflate it any more though

    Er, yes you can.

    I think.

    Or maybe you can't.

    Pretty sure you can though.
    It depends. Without the brass screwy thingy to keep the brass threaded thingy aligned, it may unseat at any time there isn't a high pressure to keep it pressed in place. Naturally, inflating it requires the valve to be unseated.

    I've managed to stuggle home with such valvues before, but Ive found that trying to pump the tyres up later is temporarily succesesful, but inevitably results in the remainder of the valve being fired across the garage a couple of minutes later and killing the cat.

    So I replace immediately these days.
  • prj45 wrote:
    Thanks chaps, my mind is at ease. Sounds like I can't inflate it any more though

    Er, yes you can.

    I think.

    Or maybe you can't.

    Pretty sure you can though.
    It depends. Without the brass screwy thingy to keep the brass threaded thingy aligned, it may unseat at any time there isn't a high pressure to keep it pressed in place. Naturally, inflating it requires the valve to be unseated.

    I've managed to stuggle home with such valvues before, but Ive found that trying to pump the tyres up later is temporarily succesesful, but inevitably results in the remainder of the valve being fired across the garage a couple of minutes later and killing the cat.

    So I replace immediately these days.

    Ah, that should be fine, we don't have a cat. :D
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