Tyre pressure advice please

Discussion in 'Motorhome Chat' started by Pat and Trish, Aug 2, 2013.

  1. Pat and Trish

    Pat and Trish Funster

    Joined:
    Jun 22, 2012
    Messages:
    376
    Likes Received:
    649
    Location:
    New Forest
    Just had four new tyres fitted to the Autotrail by a well known "national" outlet. They recommended Continental Vanco 2 109/107R
    As the fitter was finishing up the conversation went like this;
    Me) What pressure have you put in?
    Fitter) 56 psi
    Me) My book recommends 5 bar which I thought was about 70-75psi.
    F) These tyres only take 65psi but I can put 70 in if you like :Eeek:
    where does it say 5 bar?
    Paperwork retrieved from van and shown
    I then go to speak to "The Boss" and explain my confusion, he goes away to check online, on his return states that they are the right tyres and it's okay to put 70psi. I say - your fitter (who's stood alongside) said the max was 65psi.
    Boss to fitter - I've told you before they are the American and Canadian pressures not UK

    In summary I am confused and would like some reassurance that these are the correct tyres and pressure for our van The reason for changing the old ones was not to compromise on safety as although the tread was good and they were legal, they were 2007 tyres and the side walls were cracking.
    Any clarification greatfully appreciated
     
  2. chaser

    chaser Funster

    Joined:
    Feb 16, 2013
    Messages:
    7,138
    Likes Received:
    7,717
    Location:
    uttoxeter
    Good question, I am sure you'll get plenty conflicting answers, don't think anyone knows the full story, my van says 79 psi but I only put 65 in as advised by a " tyre expert" as it says max 80 on the tyre 79. Seems close to the limit to me:Eeek:
     
  3. normanandsue

    normanandsue Funster

    Joined:
    Dec 31, 2010
    Messages:
    1,296
    Likes Received:
    3,873
    Location:
    Dunfermline - Scotland
    No one knows for sure; don't make the assumption the tyre manufacturers know either. I contacted Michelin and they told me 80 psi which is the maximum tyre pressure the mh road as hard as a rock so as previously said reduced mine to 65 psi and the mh rides much smoother now.

    The answer to your question will be the average of the information you receive in answer to your thread plus your own feelings.

    Norman
     
  4. Jim

    Jim Ringleader

    Joined:
    Jul 19, 2007
    Messages:
    25,840
    Likes Received:
    76,146
    Location:
    Sutton on Sea
    It depends on the tyre. On my van if I have Michelins on they are 80psi on the rear. My present Avons run at 65psi rear.

    You need to get your axles weighed. Simple enough at your local weighbridge; then ring the tyre manufacturer, give them your axle weights and tyre details and they will tell you the precise running pressure:thumb:
     
  5. Detnor

    Detnor Funster

    Joined:
    May 12, 2011
    Messages:
    535
    Likes Received:
    464
    Having gone through the same problem, I followed Jim's advice just this week.

    I loaded up the van, filled the fuel and water tanks, and went to the local trading standards weighbridge. No charge if I simply wanted to make note of the figures, fortunately we came in 120 kilos under the 3500 limit. They seemed pleased I was at least getting the weights checked.

    I emailed the weights to Michelin (my tyre brand) along with the tyre information and within 5 minutes I had a reply (53psi in the front and 80 psi on the rears). Apparently this 80psi figure has become standard with them.

    At least I feel that I may be using the correct tyre pressure now.
     
    • Like Like x 1
  6. Pat and Trish

    Pat and Trish Funster

    Joined:
    Jun 22, 2012
    Messages:
    376
    Likes Received:
    649
    Location:
    New Forest
    Thanks for all the advice I will certainly visit the local weighbridge as a starting point and follow Jim's approach, be interesting to see the outcome.
     
  7. hilldweller

    hilldweller Funster Life Member

    Joined:
    Dec 5, 2008
    Messages:
    26,426
    Likes Received:
    25,080
    Location:
    Macclesfield
    So you have an accident and the tyre is measured at 56, your manual probably says 76.

    So what happens ?

    I don't know.

    Mine are inflated as it indicates on the driver's door and Burstner handbook, 5 bar all round.

    It's good that you have that email "in writing", print it and store it carefully.
     
  8. Jim

    Jim Ringleader

    Joined:
    Jul 19, 2007
    Messages:
    25,840
    Likes Received:
    76,146
    Location:
    Sutton on Sea
    Most motorhomes have two figures, one from the vehicle maker and another from the converter, rarely are they the same, both are normally wrong. :Doh:
     
  9. chaser

    chaser Funster

    Joined:
    Feb 16, 2013
    Messages:
    7,138
    Likes Received:
    7,717
    Location:
    uttoxeter
    That is a strange one, never heard that before 53 is the lowest I've heard of especially with 80 on the back you must have a vast weight difference front to back
     
  10. chaser

    chaser Funster

    Joined:
    Feb 16, 2013
    Messages:
    7,138
    Likes Received:
    7,717
    Location:
    uttoxeter
    At least I feel that I may be using the correct tyre pressure now.[/QUOTE]

    I wouldn't count on it:Sad:
     
  11. buttons

    buttons Funster

    Joined:
    Aug 27, 2009
    Messages:
    12,907
    Likes Received:
    10,686
    Location:
    Hertfordshire
    As a rule of thumb, if your fillings keep popping out and the wear pattern is centre tyre then they are too hard. If your fillings stay put but tyre ware is on the outer sides of the tyre then they are too soft. Works for me. :thumb:
     
    • Like Like x 1
  12. Detnor

    Detnor Funster

    Joined:
    May 12, 2011
    Messages:
    535
    Likes Received:
    464
    Yes, I have an email from michelin, with a name and a reference number.
    The rear is the same as in the Hymer handbook, the front is 5psi lower than in the handbook.
     
  13. mentaliss

    mentaliss

    Joined:
    Nov 2, 2012
    Messages:
    657
    Likes Received:
    307
    Location:
    Lancing
    _______________________________________________________________
    forget all the nonsense, go to your local free council managed weight Bridge, weigh the axles (fully loaded preferably) Note down the front and rear axle weights ring up the Tyre manufacture of your MH Tyres speak to their technical department ...they will give you the correct pressures not someones guess:thumb:
     
  14. WynandJean

    WynandJean Funster

    Joined:
    Mar 23, 2010
    Messages:
    2,371
    Likes Received:
    1,327
    Location:
    West Midlands
  15. mentaliss

    mentaliss

    Joined:
    Nov 2, 2012
    Messages:
    657
    Likes Received:
    307
    Location:
    Lancing
    YEP:RollEyes: got those too:thumb:
     
  16. hilldweller

    hilldweller Funster Life Member

    Joined:
    Dec 5, 2008
    Messages:
    26,426
    Likes Received:
    25,080
    Location:
    Macclesfield
    That doesn't sound too bad. Our front and rear are the same.

    Do they pull these numbers out of a hat ?

    As a matter of interest, what were your axle weights ?
     
  17. Pat and Trish

    Pat and Trish Funster

    Joined:
    Jun 22, 2012
    Messages:
    376
    Likes Received:
    649
    Location:
    New Forest
    Every time this happens my dentist pulls a face then suggests removing the tooth, root canal filling and cap, quote is usually around £880 :Eeek:

    Apologies for the levity I do appreciate all the advice and hope Jim brings the tyre pressure thingies to The Malvern Show :thumb:
     
  18. Phill D

    Phill D

    Joined:
    Dec 6, 2011
    Messages:
    4,414
    Likes Received:
    4,632
    Location:
    South Wales
    i have conti vanco on my motorhome and it does say max pressure on the side walls of 65psi. i weighed the van loaded and got the axle weights. i emailed conti's customer services with tyre sizes nad loads together with my axle weights.

    they confirmed the side wall marked pressure was for the american market and gave me pressures of front 70 psi rear 80psi fully loaded.

    with an unloaded van weights they gave me, 54 psi front, 62 psi rear.

    handbook says 5.5 bar ( 80 ) front and 5.5 bar (80) rear at all times. :Eeek:


    so at least ignore the tyre wall marked pressures.
     
  19. Pat and Trish

    Pat and Trish Funster

    Joined:
    Jun 22, 2012
    Messages:
    376
    Likes Received:
    649
    Location:
    New Forest
    Thanks for the confirmation Phil, I will email them as well when I have the weights

     
  20. Pat and Trish

    Pat and Trish Funster

    Joined:
    Jun 22, 2012
    Messages:
    376
    Likes Received:
    649
    Location:
    New Forest
    With such big differences being quoted between fully loaded and unloaded do people seriously adjust their tyre pressures each time they unpack from a trip. Thinking about it I suppose it depends if you use the van much unladen. :Doh:
     
Loading...

Share This Page