Author [NL] [FR] [ES] [DE] [SE] [IT] TOP TIP - Valve Cores - They can Let You Down !  (Read 355 times)

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  • Offline Coconut   gb

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    Offline Coconut

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    TOP TIP - Valve Cores - They can Let You Down !
    on: Nov 16, 2022, 09.21 am
    Nov 16, 2022, 09.21 am
    Hopefully this Topic will give some simple advice that could help "further down the road" ......

    We all know that the tyre / tires are pumped up via the Valves on each wheel.

    The Front wheel pressure is recommended at 36 PSI and the Rear at 42 PSI -
    Some Members vary this to suit their individual circumstances and conditions.

    Many of us, especially on a long run or when Touring will carry a Tyre Pump
    and maybe some form of puncture repair kit.

    Most of us will regularly check the condition of our tyres for wear, damage,
    foreign objects ( nails /  screws etc ), but how many of us
    EVER check to see whether the Valves are leaking ?

    The Valve Stems have a screw in Valve CORE, which generally has
    two tiny "O" Rings holding all that pressure in the tyre !

    ( The Screw On Cap is NOT intended to keep the pressure in.
    It's purpose is purely as a "Dust Cap" to keep dirt and water out ! )

    Here's a typical Valve Core showing the location of the two "O" Rings :

    If either "O" Ring fails, which can happen due to AGE, air will escape and the tyre will deflate.  :138:

    Valve cores should therefore ALWAYS be replaced at every tyre change.  :169:

    There is usually a seal between the Valve STEM and the Wheel Rim,
    and these should also be considered for replacement when tyres are changed for the same reason :
    ( Some valve stems are made of rubber.  They form their own seal to the wheel rim -
    and the complete Valve stem and valve core is replaced when the tyre is changed )

    The Valve CORES simply screw in, which means they can also UNSCREW,
    and if this happens because, for example, they weren't tightened sufficiently when fitted,
    or have maybe vibrated loose, then the seal around the Core body can be broken and air can leak out.  :172:

    Think : What you would YOU do if one of your tyre valve cores worked loose while out on a ride, or on tour ?
    How would you sort it out ?  Do you carry a tool to screw the Valve Core back in and reseal it ?
    It can't be done with an ordinary screwdriver - a special tool is needed,
    but how many of us actually carry one of these with us ?

    The Tool is CHEAP and available in different designs :

    There's one with a handle like this :

    ... a "Multi Tool" that can also be used to clean up the threads on the inside and outside of the Valve Stem :

    ... and my personal favourite : a version that replaces the Dust Cap on the Valve Stem
    with the Valve Core Tool incorporated into it.  Always with the bike, and takes up no extra room ! :

    It's a "No-Brainer" to always carry one of these on your bike ( and any other vehicle ).

    When you are completing your Pre-Ride / Weekly checks etc, and at any other time
    that you check the tyre pressures, or when cleaning your Bike, take the Dust Cap off
    and check if the Valve core is leaking - by wiping a film of water ( or good old fashioned "spit" )
    over the top of the Valve stem.  When washing the bike, a soapy film of water is even better,
    and can also be applied around the base of the Valve stem to check for any leaks there.

    Even the slightest air leak will show up as a bubble or bubbles, which can then be rectified.  :028:

    Cheers  :821:


  • Offline digital   es

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    Re: TOP TIP - Valve Cores - They can Let You Down !
    Reply #1 on: Nov 16, 2022, 08.44 pm
    Nov 16, 2022, 08.44 pm
    Thanks for the input and you are absolutely right. Few of us carry such a necessary simple tool.  :047: :821: :047:
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  • Offline trophied   us

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    Re: TOP TIP - Valve Cores - They can Let You Down !
    Reply #2 on: Nov 16, 2022, 10.57 pm
    Nov 16, 2022, 10.57 pm
    Thanks to 2slowtrophy I have geniune Triumph valve caps with the logo and am very proud of them!  I do carry a cap that has the tool on it in my "possibles" kit.
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  • Offline atrophy   us

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    Offline atrophy

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    Re: TOP TIP - Valve Cores - They can Let You Down !
    Reply #3 on: Nov 18, 2022, 11.42 pm
    Nov 18, 2022, 11.42 pm
    Those compact tire pumps that we carry can loosen the valve core through vibrations.  I learned that on the road so I now carry a small valve core tool and a spare valve core.
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