Tyre Pressures.

Discussion in 'Motorhome Chat' started by green machine, Mar 22, 2010.

  1. green machine

    green machine Read Only Funster

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    Hi All :Sad:

    This thread must of been covered before, but I have just had four new Avon tyres fitted on the motorhome. (Autotrail Apache 700SE on a Fiat base) The guy at the garage said that he has put 40psi in the front and 55psi in the back. This goes against the sticker on the inside of the door frame. Can somebody please tell me what the correct tyre pressures should be !! This seems to be a bit of a minefield.

    Kind Regards

    Green Machine
     
  2. American Dream

    American Dream Read Only Funster

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    If the tyres are to standard spec for the vehicle...I'd stick to
    the pressures on the label on the vehicle.
     
  3. Hayleylulu

    Hayleylulu

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    i put 50psi in my fiat ducato:thumb::thumb:
     
  4. VMax666

    VMax666 Read Only Funster

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    If the plate on the door panel is Fiats, that will cover that chassis as an original unit, they have no idea which manufacturer,or type of body, it will end up as. There is only one way to determine the correct tyre pressures. 1 -Load the vehicle with your normal gear. 2- go to a weighbridge and get the axle weights. 3- ring the tyre manufacturer, ask for technical, give them the tyre sizes and the axle weights. They will give you the correct pressures. VMax
     
  5. Brian and Jo

    Brian and Jo Funster Life Member

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    tyre pressures

    hi there green machine,what size tyres are they?i think on an apache they are 215/75/16.
     
  6. pappajohn

    pappajohn Funster Life Member

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    have a look at this download.

    TYRE PRESSURE CHART

    the sticker in the door hole probably says 5.5 bar/80psi....far too high and thats the tyres absolute max pressure.:Eeek:

    you will need to know your axle weights or just what it says on the VIN plate under the bonnet and reduce pressure to suit the ride.

    scroll to one of the bottom two charts depending on whether proper camping tyres or commercial tyres are fitted.

    find your tyre size and reference across to the axle weight for front and rear.

    my 3850kg kontiki is 65 rear and 59 front on 215/70/15 tyres
     
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  7. lookback

    lookback Read Only Funster

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    With my Avon tyres on a 3500kg autotrail cheyenne the tyre pressures are front: 60psi and rear: 65psi.

    Ian
     
  8. green machine

    green machine Read Only Funster

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    Tyre Pressures

    Hi Brian

    They are as you say, 215/75/16.

    Regards

    Green Machine
     
  9. green machine

    green machine Read Only Funster

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    Tyre Pressure Chart.

    Hi Pappajohn

    I am not able to open the chart. Is anybody else having problems with it.

    Thanks

    Green Machine
     
  10. Diabalo

    Diabalo Funster

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    Green Machine,

    No it doesn't work, but you can find it in Downloads under useful tools on this site:thumb:
     
  11. Wall-E

    Wall-E Read Only Funster

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    Tyre pressures?

    Hi green machine,
    Now this will I am sure cause some controversy, I have been told in the past that the label on the door pillar doesn't refer to Tyre pressures at all, but confirms what the braking system has been tested to, eg 80psi. If it referred to tyre pressures, surely there would be two sets of figures?, Front wheels, Rear wheels?. Also unless you have Metal tyre valves fitted inflating the tyres to 80psi you would run the serious risk of blowing rubber valves out of the rim!!.
    The only way to confirm what pressure to inflate your Motor Homes tyres too, is to load it up with everything you normally carry, take it to a weighbridge and Weigh it, Gross weight, front axle, rear axle. Then ring your tyre manufacturers Technical department and ask them for the recommended tyre pressures you can safely run at, based on YOUR loadings. Any other way is pure guess work.
    Cheers Wall-E.
    PS, are your Avon tyres of the correct ply rating?.
     
  12. Brian and Jo

    Brian and Jo Funster Life Member

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    tyre pressures

    hi there green machine.ok that being the case i would set them at 65psi front and rear:thumb:
    the tyre pressures that the man in the garage has suggested are way to low,and at 40psi after a period of time would seriously damage the sructure of the tyre.the avon tyres that have been fitted should be 8ply which im sure they are.on the autotrail cheiftain that we used to have the pressures were set at 75psi but that was a larger motorhome.it was same size tyre in michelin camping.in my experiance with a motorhome the tyre pressures are down to the drivers common sense and what he or she thinks the motorhome feels happy at.the documented tyre pressures for motorhomes can sometimes make the vechicle feel unstable.so being one of the old school i feel that a lot of this subject is down to common sense and regular checking. regards brian jo & josh
     
    Last edited: Mar 23, 2010
  13. pappajohn

    pappajohn Funster Life Member

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    same link.....we'll see if this works...

    TYRE DATA
     
  14. pappajohn

    pappajohn Funster Life Member

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    strange.....after posting the second link the first link now works for me:Eek!:
     
  15. pappajohn

    pappajohn Funster Life Member

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    and now, neither of them work. :Doh:

    could be a server problem maybe. ?
     
  16. dave jm

    dave jm Read Only Funster

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    Have you forgotton how to do it:Rofl1:
     
  17. pappajohn

    pappajohn Funster Life Member

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    No!!!! the original link didnt work for me either so i posted the link again.

    checked the first one again and it worked fine after that.
    checked again a minute later and that failed as well as the second.

    Mystery !!!!
     
  18. Braunston

    Braunston Read Only Funster

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    Hi,

    Are the new tyres capable of operating at the pressures shown on inside of the door frame?, what type and specification tyres were orginally fitted to your motorhome, if the orginal specification was for camping variant tyres then it is quiet possible that if you have changed to a standard van tyre then they may not be suitabale for running at the manufacturers recommended pressure.


     
  19. lebesset

    lebesset Read Only Funster

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    weigh your axles at the max load you run at

    got to the toyo website

    look on the tyre to find the load index which will look something like 109/107 [ a tyre carries more single than it does twin for obvious reasons ]

    find the commercial chart that shows you what weight a given load index tyre will carry at a given pressure

    set to the pressure for YOUR load

    unfortunately the loads are given in lbs so you will have to convert if you weighed in Kg

    the figures given are the official ETRTO ones

    easy , ain't it :Smile:
     
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