Mountain Bikes · Public discussion

Questions about Swinger air shocks.

Started by Rural QLD CC · · Last activity · 5 posts · 550 views

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Mountain Bikes
Published
12 July 2004
Last activity
12 July 2004
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Rural QLD CC
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  1. Greetings,
    My VT3 is fitted with a Swinger SPV air shock on the rear.
    I'm curious to know how often I'm going to need to check the pressures. The
    shop set the bike up when I got it and wrote down the pressures they'd set,
    but when I checked it on the weekend, they were quite a bit lower than that.
    It's only had a little bit of riding since new......probably 50-60km of
    'proper' offroad riding, plus a little bit of 'commuting' riding thrown in.
    Is this the sort of thing I should check prior to every ride? I inspect all
    the obvious stuff before every ride......tyre pressures, chain condition,
    brakes and such.

    I'm actually getting some serious withdrawl at the moment.....my GF has been
    sick with the flu, so we haven't been for a ride in over a week!! Hate that
    :-(

    MrBonk
    www.mrbonk.com

  2. "Rural QLD CC" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    Greetings,
    My VT3 is fitted with a Swinger SPV air shock on the rear.
    I'm curious to know how often I'm going to need to check the pressures.


    The

    Quoted message said:

    shop set the bike up when I got it and wrote down the pressures they'd


    set,

    Quoted message said:

    but when I checked it on the weekend, they were quite a bit lower than


    that.

    With most pumps when you check the pressure, some air escapes into the
    chamber of the pump giving a lower pressure reading. Bit like the rule in
    science that says whenever you subject something to testing the results will
    always be skewed by the act of testing itself. Theres probably a catchy name
    for it but I forget.

    Steve.

  3. On 2004-07-12, spademan o---[) * penned:

    Quoted message said:


    With most pumps when you check the pressure, some air escapes into the
    chamber of the pump giving a lower pressure reading. Bit like the rule
    in science that says whenever you subject something to testing the
    results will always be skewed by the act of testing itself. Theres
    probably a catchy name for it but I forget.

    Heisenberg Uncertainty Principle:

    http://www.aip.org/history/heisenberg/p08.htm

    --
    monique

  4. spademan o---) * said:

    "Rural QLD CC" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    Greetings,
    My VT3 is fitted with a Swinger SPV air shock on the
    rear. I'm curious to know how often I'm going to need to check the
    pressures. The shop set the bike up when I got it and wrote down the
    pressures they'd set, but when I checked it on the weekend, they
    were quite a bit lower than that.

    With most pumps when you check the pressure, some air escapes into the
    chamber of the pump giving a lower pressure reading. Bit like the
    rule in science that says whenever you subject something to testing
    the results will always be skewed by the act of testing itself.
    Theres probably a catchy name for it but I forget.

    The technical term for this phenomenon is, "Psssssss!" (For high pressure
    road tires, it's "THWAPP!!!"😉

    Bill "pedant" S.

  5. S o r n i said:

    The technical term for this phenomenon is, "Psssssss!" (For high pressure
    road tires, it's "THWAPP!!!"😉

    Ah, so that 'thwapp, thwapp, thwapp' noise was just you having issues with
    road tyres... ;0p

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