Surprised! Tyre Pressures [again]

Discussion in 'Tech/Mech General' started by Langtoftlad, Jul 8, 2016.

  1. Langtoftlad

    Langtoftlad Funster Life Member

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    Just had 4x Conti Vanco Campers put on & took the opportunity to nip across the road to a recycling depot to get weighed...

    So total was 3180 which is pretty much the same as I had from last year and way under the 3400 max (y) but I also wanted axles for tyres - trouble is it was one of those above ground units with a small ramp - I did the best I could getting the front just off the bridge to get another weigh. I'd love to have a 3rd but the guy was getting a bit tetchy so I didn't push my luck.

    So rear was 1520, well under the 1900 max and by subtract I estimate the front to be approximately 1660, which ok I guess with a max front of 1750.

    Anyway to get to the point - following funsters recommendations, I phoned up Continental Tech Services, gave my details and the very nice Emma advised that 3.75bar (54psi) front & 4.00bar (58psi) on the rear should do nicely.

    Well I'm surprised - I'll need to be letting some air out, the fitters put in 70psi all round.
    From general reading, I thought recommended pressures would be a lot higher than 55/58
    Anyone else surprised?
     
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  2. Baycott

    Baycott Funster

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    Yes, I'm surprised.
    Michelin quoted me 80psi rears and 58psi front. Mind you, my van is close to its max of 3800 :Eeek:
     
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  3. Robert Clark

    Robert Clark Funster Life Member

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    I'm not surprised
    We're 4.2 tonne and have 47 and 72 psi in our Continentals
    After 20,000 miles, tyre wear is even and fuel consumption is great
     
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  4. funflair

    funflair Funster Life Member

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    Depends on the tyre load rating but not really surprised, only thing I noticed was that the rear was higher pressure than the front but a lower weight.

    Martin
     
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  5. Nirvanauk

    Nirvanauk Funster

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    Sounds about right
     
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  6. Langtoftlad

    Langtoftlad Funster Life Member

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    Perhaps Emma has a default add x KGS for beer/wine :D
     
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  7. WillH

    WillH Funster

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    I run 55psi front and rear, have done for years. Wear pattern is okay after 20k miles so must be near right.
     
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  8. SMB

    SMB Funster

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    Not surprised at all, my van is on the Ducato chassis and 4005kgs and I have Vanco Fourseasons tyres. Fiat recommend 5.5 bar front and back but I contacted Continental who sent me a chart for my tyres recommended pressures, now I have 49psi front and 62psi rear
     
  9. Jaws

    Jaws Funster Life Member

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    75 in the fronts and 55 in the rears is what is recommended for mine.. Spoke to Avon support ( as a trade account holder ) and they came back with...

    75 front and 55 rears ! LOL !!
     
  10. sdc77

    sdc77 Funster

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    We have conti 4 seasons ...
    Front 1720 45psi
    Rear 2220 62psi
    From conti
     
  11. mikebeaches

    mikebeaches Funster

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    Just got a new Rapido pvc which has come with Michelin camper tyres and I'm a bit annoyed. Previously had Continentals on the last van; and with sensible advised tyre pressures which gave a reasonable ride.

    BUT Michelin always recommend 80 psi on the rear, regardless of the motorhome axle weight. Way too hard in my opinion, but what do you do if that's what the converter AND the tyre manufacturer both recommend? Grr...
     
  12. treetops1

    treetops1 Funster

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    49psi on the front,60 psi on rear .Any more and it makes a very hard ride .Michelin all round .23,020 miles ,seem hardly worn
     
  13. tonyidle

    tonyidle Funster

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    As tyre pressures should not depend on make of tyre I'd like to put together a table based on the info supplied so far. To do that I'd need: Vehicle weight; axle weights (both loaded); tyre size (dia, aspect ratio, width); load rating; pressures for each axle (from tyre manufacture); make & type of tyre (camper, winter, summer, MS, etc). If it could be held somewhere accessible on the Forum where it could be added to as time went on it would be a useful resource.
     
  14. funflair

    funflair Funster Life Member

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    For anybody who has not seen this I found it a really good read (sad I know) http://www.conti-online.com/www/dow..._info/download/technical_data_book_pdf_en.pdf

    Start at about page 14 for van tyres, I could be wrong but I think if you find your tyre size and load rating it will give you your tyre pressure for various axle weights.

    It might be worth a few interested people who have come by their tyre pressure some other way doing a cross reference and see if it works out using the continental charts.

    Martin
     
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  15. Don Quixote

    Don Quixote Funster

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    Well I have mine set to 61PSI having tried a few settings and find with or 350kg MH road noise and handling is fine. On the tyre monitor after driving for 1/2 hours they warm up to a max 71PSI all round, but usually sit around 68PSI mark. Happy enough.
     
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