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Tyre Pressures-Chalk Test

Discussion in 'General Land Rover Forum' started by The Mad Hat Man, Oct 20, 2012.

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  1. The Mad Hat Man

    The Mad Hat Man Well-Known Member LZIR Despatch Agent

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    blow them up to a nominal value,
    rub a line of chalk across the tyre,
    drive a couple of hundred yards in the dry,
    look at chalk mark,
    if centre of chalk mark is worn off, decrease pressure,
    if outside of chalk mark is worn off, increase pressure,
    repeat until all of chalk is worn off uniformly,

    tyre pressure is ideal for your motor, loaded as per test.
     
    Last edited: Oct 22, 2016
  2. easye1

    easye1 Banned

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    read this through a few times then thought about it...

    it`ll work just fine on new tyres, but wont if you use preworn tyres, as they too may have un normal tyre wear for your chalk test - perhaps..
     
  3. Superted87

    Superted87 Member

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    Remember chaps, this does not work on a chalk surfaced road !
     
  4. easye1

    easye1 Banned

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    good god, how would this work then on chalk roads of dover, or, or , or maybe.... :rolleyes:
     
  5. 300bhp/ton

    300bhp/ton Well-Known Member

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    Also depends on what use you are using the vehicle for. Towing you'll probably want slightly over inflated, off road under inflated. And tyre type, side wall height, ply thickness. Suspension geometry will also affect this, as the chalk test assume the tires is completely vertical with 0 toe in/out, no caster and 0 camber.
     
  6. norseman

    norseman Well-Known Member

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    Sounds like someone is trying to re-invent the wheel (no pun intended)
    Over the last five decades I have realised decent mileage averages on tyres just by sticking to the manuf. stated settings, without faffing about with bits of chalk.
     
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  7. flyingbanana

    flyingbanana Member

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    So are we any closer to what pressure ?
    As its raining I can't try this
    Some one must have these and must know
    Andy
     
  8. wooly123

    wooly123 Member

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    use waterproof chalk ?
     
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  9. Coffeelandy

    Coffeelandy Well-Known Member

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  10. freelance

    freelance Well-Known Member

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    Mistake! Sorry, thought I was on word association thread.
     
  11. mik

    mik New Member

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    Sheesh!....this is about one of the best ways of spotting a deflated or over inflated tyre! This I must try as looking at other threads tyre pressures thet range from 24 to 32 bar!!!! Thanks tmhm!
     
  12. MULDERKE

    MULDERKE Well-Known Member

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    Ok Pals.
    Getting some dry weather would be a start. Until then I'll stick at 32 lbs and see how we go.
    Must say though, can really feel the difference with these tyres on compared to my old set. Now, they were road tyres and yet the new set has better road grip.
    I'll see how they fare off road in a week or so.My hobby takes me off road (shale, small rocks & mud) every other weekend, so well see how we go.
    Cheers ALL.
     
  13. Oldseadog

    Oldseadog Well-Known Member

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    28 psi in the front and 32 psi in the rear for normal road driving

    Off road 16psi all round, but remember to pump them up after your play!
     
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  14. LordOWar

    LordOWar Active Member

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  15. EvanCooper39

    EvanCooper39 New Member

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    I usually just go with the manufacturer's recommendation. I'm too lazy to play around with chalk. Did you make a hop-scotch on your tyres?
     
  16. Turboman

    Turboman Rural Activist

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    Recommendation doesn't take into account actual loading. Which may vary widely.
    We used a version of the chalk test to inflate tractor tyres, although we didn't actually use chalk. We just parked the tractor on a concrete floor, and then inflated until the lugs were flat on the floor across the bottom.
    The actual pressures would be quite different if you had an implement or lift box on the arms, or unladen.
     
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  17. kevstar

    kevstar Well-Known Member

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    Have you've been sniffing the chalk lol good luck getting 24 bar into a tyre :p
     
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  18. dieseldog69

    dieseldog69 Well-Known Member LZIR Despatch Agent

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    :eek:
    24 bar :eek::eek:

    That's as near as dammit 350psi :rolleyes:
     
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