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Presta Valves Silly Question?

Discussion in 'Bicycle Mechanics and Repairs' started by mondobongo, 14 Apr 2008.

  1. mondobongo

    mondobongo Über Member

    Just swapped tubes over on my road bike, previous valves were smooth new ones are threaded do I need to screw on the threaded washer?

    Not at all interested in the weight implications more the possible movement of the valve against the hole in nice soft alloy.
     
  2. col

    col Veteran


    Its there to stop the valve going in when you press a pump onto it,as well as any movement of the tube in the tyre,i would put it on.
     
  3. Bin them, they'll just slow you down.
     
  4. fossyant

    fossyant Ride It Like You Stole It!

    Location:
    South Manchester
    I never use the screws as IMHO I think they put more pressure on the valve stem, or encourage you to do so when pumping up the tube
     
  5. bonj2

    bonj2 Guest

    I drill them.
     
  6. OP
    OP
    mondobongo

    mondobongo Über Member

    What size bit do you use Bonj?
     
  7. alecstilleyedye

    alecstilleyedye nothing in moderation Staff Member

    on one bike i always put the washer on, the other i don't need to so much as the rims are deeper, which stops the valve moving about.
     
  8. John the Monkey

    John the Monkey Frivolous Cyclist

    Location:
    Crewe
    I use them on rims with a flat surface (are these called box section?) On the new bike, which doesn't have a flat surface where spokes meet rim, I don't.
     
  9. 02GF74

    02GF74 Über Member

    interestng - you are referring to the round nut that goes onto the valve stem.

    If the tube came with them, I fit them. It never occured to me not to.... but now that is has been mentioned, I can't really see what purpose they serve other than making it easier to pump up a flat tyre wuth a hand pump as that usualyy results in pushing the valve stem in into the rim making it harder to pump up, obvisouly the probkemn goes away once there is air in the tube.