Tyre Pressure Gauge Guts

Discussion in 'Technical & Motorcycle Services' started by ianyonok, Apr 3, 2020.

  1. ianyonok

    ianyonok Ol'Timer

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    Ever wondered what was inside a tyre gauge? No, me neither.
    But mine stopped working, so thought I'd have a look inside.
    I bought this gauge at Halfords when I was a kid, for bicycles.
    20200403_134656.
    Ah, rather clever. The top of the brass piston has a screw holding a leather sealing washer which had worn out.
    I cut a small piece of leather off the missus' handbag.... an old one... Then punched out a washer with i.d. tight on the piston stem and o.d. slightly larger than the tube bore.
    After fitting the washer, it needed squashing with oil a bit and poking into the tube. But after some working in and out, it loosened up and after re-assembly, the gauge looks like it will last another 50 years...
     
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  2. canthai

    canthai Ol'Timer

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    I have one in all my vehicles. Most the type you show, but also a couple of dial types.
    All read different - some close, but different.
    Surprisingly - the dial type always reads higher than the piston type - only a couple of lbs, but noticable.
    My HD does not seem to mind the difference, or the CB650 or the CRF. So I go with whatever gauge is on the bike.
    Thanks for the pic - never had one apart.
     
  3. DavidFL

    DavidFL Administrator
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    What is the age of that gauge then?
    It has a long life.
     
  4. ianyonok

    ianyonok Ol'Timer

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    I have had this gauge about 50 years. It worked fine, for the first 49 of them.
     
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  5. scotty007

    scotty007 Ol'Timer

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    Remember using pumps like this as a kid! Taking them apart to see if they could be made to pump the bicycle tyres up quicker! Sure is a testament to the manufacturing of the day there is no way a modern pump would last even 10 years now.
     
  6. ianyonok

    ianyonok Ol'Timer

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    Hi Scotty,
    Well, maybe it depends what modern pump you buy.
    I just bought a pump for a 1940 BSA M20 (fits on lugs on the underside of the petrol tank) and it is surprisingly well made. All steel body and tube with aluminium end piece.
    20200403_115348.
    It weighs about half a kg and has strong pressure. 56 pounds from Draganfly Motorcycles in UK.
     
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  7. Oddvar

    Oddvar Ol'Timer

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    This is a 1200 bath bicycle pump capable of 90 pounds. Been glued several times and is about 3 years old. Comes with me on dirt bikes. The only nice thing about it is weight and size.;)
    2020-04-12 11.26.48.
     
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  8. ianyonok

    ianyonok Ol'Timer

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    That looks great, easy tuck in a bag.
     

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