Just had 4 new Michelin tyres fitted

Discussion in 'Motorhome Chat' started by Nirvanauk, Mar 12, 2015.

  1. Nirvanauk

    Nirvanauk Funster

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    They were 8 years old so not bad but no sign of wear or cracking. They are Agilis camper tyres and the four cost £645 from a Michelin dealer.
    I asked what the tyre pressures should be and he didn't know but told me to consult my base vehicle handbook ( which is a Renault Master) and that says 4.4 bar and 3.8 bar but doesn't that depend on the type of tyre as opposed to the type of vehicle? Any advice please?
    Thanks.
     
  2. Sidney

    Sidney Funster

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    To give the default MHF answer...

    Go to a weighbridge, weigh the front and rear axles, give the axle weights to Michelin via their website. They will say put 5.5 bar in the rear and the front will be based on the axle weight.

    Then come back and say "These tyres give a hard ride. What tyre pressures do funsters have on theirs?"

    We give suggestions varying from 3 bar to 4.5 bar.

    In the end you'll find what works for you.
     
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  3. Ber090

    Ber090 Funster Life Member

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    If you email Michelin with your actual axle weights they will tell you the suggested pressures.
    Cheers
    Bernie
     
  4. Jim

    Jim Ringleader

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    80 psi, I've never heard Michelin tell anyone any different.
     
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  5. Sidney

    Sidney Funster

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    and of course I forgot to say...

    I hope the tyre fitter used high pressure (steel) valves
     
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  6. Brian and Jo

    Brian and Jo Funster Life Member

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    Tyre pressure for all Michelin Camping tyres is 80 psi regardles of size(y)
    Brian & Jo
     
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  7. mentaliss

    mentaliss

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    This Calculation is considered to be the most effective way to set your tyre pressure's:
    The load index ( 112) means that at max pressure the tyre can support a load of 1120 or 2240kg per axle

    Example:
    Max pressure 80psi divide by max load 2240 = 0.357 x actual load 1950 = 69.6psi

    the above calculation would suggest that the rear axle tyre pressure's should be around 70psi
    please note I am not the original author of this information
     
  8. mentaliss

    mentaliss

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    Sorry, what your quoting is the max pressure that the 112 index tyre will inflate to not the pressure it may need to support the load
     
  9. DonA4000

    DonA4000 Funster

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    In my motorhome hand book it says (rear) 5.5 bar (80 psi) but on the side wall of the tyre (continental van/camper) says maximum 69 psi, so what you suppose to do then? o_O
     
  10. Jim

    Jim Ringleader

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    Except Michelin for some reason don't do those calculations. No matter what combination of gross or axle weights you supply them. They always come back with 80psi.
     
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  11. Techno

    Techno Funster Life Member

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    Michelin will only give a weight related pressure for the fronts, their policy for some years now is to quote the max 80 psi on the rear as Jim said. They believe that the majority of vans are overloaded at some point so will not give on that.
     
  12. Brian and Jo

    Brian and Jo Funster Life Member

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    ring michelin technical,they will clarify it(y)
    Brian & Jo
     
  13. TheDogMan

    TheDogMan Funster

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    I had 6 fitted( double wheel at back) 2t front axle 3.2t rear axle, I was adviced by fiiter to go 70 - 75 psi, oh and yes mitchelin will say 80 as that the tyre max marked on the side
     
  14. Sidney

    Sidney Funster

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    Yes 5.5bar = 80 psi ...but they do give lower figures for the front tyres (based on the axle weight)
     
  15. Ber090

    Ber090 Funster Life Member

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    Jim, Sydney is correct. Michelin will give various pressures for front bot stick to 80 for rears.
     
  16. wingman

    wingman Funster

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    Oh Lord! I get sooo confused when this thread appears occasionally. I hope 60/65psi (front/rear) is enough for my 7.2m van. Can't be arsed with weighing it, sounds so much agg' (n)

    Wish the dealerships or whoever would just provide a rough guide, assuming a given load. They do this with cars.....On the door pillar you get a picture of the number of occupants next to the tyre size fitted, then the required tyre pressure. Simples!

    Yeah, I know what you're honna say; dealerships wouldn't know how much tut you put in your van. Some folk travel light, whilst others carry everything from Avalanche poles to a gas rattle! Having said that, couldn't they come up with an equation based on max payload?

    When white van man buys a Tranny, no one asks him to go to a weighbridge with all his tools in it, he just looks at the door pillar.

    Is there a more simple rule of thumb? Tyres hot - pressure too low...... Dental fillings knocked out, pressure too high (y)
     
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  17. ASel

    ASel Read Only Funster

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    Iveco in their manual provide tyre pressures for different axle loadings, do other manufacturers not give this info?
     
  18. Brian and Jo

    Brian and Jo Funster Life Member

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    in the main michelin say 80psi but very occaisionally they will say 69psi front but in the main its 80psi regardless(y) whenever we have a motorhome in for tyres i will always do a bit of spade work before it arrives as to tyre pressures,wheel nut torque settings etc.cos it is a minefield.
    Brian & Jo
     
  19. Techno

    Techno Funster Life Member

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    They gave 65 psi for my fronts for previous owner with 1820kg and at that time 2008 they gave 60 for the rear. 116 load index
    I have altered these myself due to increased loadings and now have 67 front 80 rear.

    These so far all increase by 8 psi when driving (Tyrepal)
     
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  20. Brian and Jo

    Brian and Jo Funster Life Member

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    that is 64psi and 55psi,way to low for Michelin Camping tyres.
    Brian & Jo
     
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