Tyre pressure

Discussion in 'Motorhome Chat' started by DBSilverfox, Mar 21, 2011.

  1. DBSilverfox

    DBSilverfox Read Only Funster

    Joined:
    May 13, 2010
    Messages:
    592
    Likes Received:
    98
    Location:
    Nottingham
    Can I just make sure I have this right?

    i have an Autoquest 100, maximum load on each axle is 1600 kg. The van is fitted with the standard tyres, 195/70R 15C, 104/102R

    In the handbook it says tyre pressures front and rear should be 44psi.

    If i check out this website http://www.tyresafe.org/data/files/motorhome leaflet.pdf

    It says it should be 57 psi. On the inside of the door there is a sticker saying the tyre pressure should be 58.

    So am I right to ignore the handbook and go with the 57psi? It just seems to be a really big difference between the two "versions of the truth"

    Thanks

    David
     
  2. paulmold

    paulmold Read Only Funster

    Joined:
    Jun 15, 2009
    Messages:
    895
    Likes Received:
    301
    Location:
    North Wales
    I also have such a discrepancy between the handbook and the sticker/tyresafe website. I have been advised to always go by the sticker on the door post which is what I do.
     
  3. icantremember

    icantremember Funster

    Joined:
    Sep 2, 2010
    Messages:
    5,059
    Likes Received:
    7,107
    Location:
    Nr Watton in Norfolk
    The only sure way to get correct pressures is to contact the tyre manufacurer by tel or email with the details of your tyres ( size & rating etc all on the tyre sidewall) together with maximum axle loadings.

    To get accurate axle loading it is worth using a public weighbridge with the m/h fully loaded.

    I did this with Michelin and they replied very quickly with correct pressures.

    Hope this helps
     
  4. GJH

    GJH Funster Life Member

    Joined:
    Aug 20, 2007
    Messages:
    27,237
    Likes Received:
    34,454
    Location:
    Acklam, Teesside, originally Glossop
    We run our Autoquest 100 on 44psi (as per Explorer Group recommendations) and it handles, noticeably, much better than at the higher pressure.

    I downloaded a small HTML data sheet from the Explorer web site not long after we got our van. It has since been deleted from the Explorer site (they only maintain newer documents) but I will be happy to send it as an e-mail attachment if you wish David, just send me your e-mail address in a PM.
     
  5. DBSilverfox

    DBSilverfox Read Only Funster

    Joined:
    May 13, 2010
    Messages:
    592
    Likes Received:
    98
    Location:
    Nottingham
    Thanks, yes, i took it over a weighbridge to check if i needed to go on a diet :BigGrin:

    I adjusted mine yesterday before going out and dropped them from the 50+ they were, down to 44. I agree the ride was much smoother and not so "bouncy". Then I discovered the web site, and that got me concerned...

    Might check with the tyre suppliers. don't understand why it can't be simple :Angry:

    David
     
  6. poppys

    poppys Read Only Funster

    Joined:
    May 8, 2010
    Messages:
    166
    Likes Received:
    41
    Location:
    Norfolk
    I have a Elddis Firestom,which is the same as the Autoquest on a Peugeot boxer base,with standard tyres.The door pillar sticker says 58 psi,it does seem to be a hard ride so I think I shall reduce the pressure to 50 and see how it goes.But if anyone gets the definitive answer could they please post it. Chris
     
  7. nannyjan

    nannyjan Read Only Funster

    Joined:
    Mar 22, 2010
    Messages:
    126
    Likes Received:
    51
    Location:
    Forest of Dean, Glos
    Hi David, I have an Autoquest 130 and I was so confused with conflicting advice on tyre pressures so I telephoned the tyre manufacturers and they were so helpful. They advised me to drive to a weigh bridge station and get the front, rear and total axle weight and to telephone them back with these details and whilst on the telephone they advised me of the correct tyres for front and rear tyres. The front tyre pressure advised was 55 with maximum weight of 1516 and the rear was 66 with maximum weight 1755. Hope this is of help to you. I dont have their telephone number to hand but you will find it on their website www.conti-online.com Keep Smiling Nannyjan
     
  8. GJH

    GJH Funster Life Member

    Joined:
    Aug 20, 2007
    Messages:
    27,237
    Likes Received:
    34,454
    Location:
    Acklam, Teesside, originally Glossop
    I've just had a look at the Explorer web site and found that they now have the Motorhome Handbooks in the Archive Section.

    In the 2005 edition they say:
    Interesting that in the 2003 handbook the front and rear pressures are 44psi for all Autoquest/Avantgarde models but in the 2004 handbook they are 44psi for the 100 and 200 models but 66psi for the larger ones.

    They don't have a contact e-mail address but there are geographic address and telephone/fax numbers Here if anyone fancies contacting them.
     
  9. motor roamin

    motor roamin Funster

    Joined:
    May 23, 2010
    Messages:
    1,535
    Likes Received:
    785
    Location:
    Leicester
    Hand books often give the wrong tyre pressure the reason being that this will usually give a better ride, but tyre pressures are so important to get correct for more than one reason, too lower pressure will cause overheating excessive tyre wear and poor fuel consumption, too higher pressure will cause excessive tyre wear poor handling, both can lead to a blow out and will cost money at best lives at worst.

    icantremember is spot on with the best way to get the correct pressure and of course check them often, tyres are so often overlooked.

    Hope this helps.

    All the best Rick.
     
  10. GJH

    GJH Funster Life Member

    Joined:
    Aug 20, 2007
    Messages:
    27,237
    Likes Received:
    34,454
    Location:
    Acklam, Teesside, originally Glossop
    But surely if a handbook gave a pressure that (being wrong) was dangerous or even just if it led to excessive wear (= shorter life) wouldn't the company be liable for the consequences?
     
  11. DBSilverfox

    DBSilverfox Read Only Funster

    Joined:
    May 13, 2010
    Messages:
    592
    Likes Received:
    98
    Location:
    Nottingham
    ha ha - it is all becoming so much clearer isn't it? :Doh:

    David
     
  12. GJH

    GJH Funster Life Member

    Joined:
    Aug 20, 2007
    Messages:
    27,237
    Likes Received:
    34,454
    Location:
    Acklam, Teesside, originally Glossop
    You'll have to give Explorer a ring David :BigGrin:
     
  13. Terry

    Terry Funster

    Joined:
    Dec 27, 2007
    Messages:
    10,722
    Likes Received:
    6,224
    Location:
    South yorks
    I would give the tyre company a ring :Wink::BigGrin::thumb:
    terry
     
  14. DBSilverfox

    DBSilverfox Read Only Funster

    Joined:
    May 13, 2010
    Messages:
    592
    Likes Received:
    98
    Location:
    Nottingham
    no phone number for Bridgestone, so email has been sent. Will let you know what they say :Smile:

    David
     
  15. DBSilverfox

    DBSilverfox Read Only Funster

    Joined:
    May 13, 2010
    Messages:
    592
    Likes Received:
    98
    Location:
    Nottingham
    Quick response from Bridgestone - very impressive:

    Here was the question:

    I have a Motorhome fitted with Bridgestone 195/70R 15C, 104/102R tyres. Handbook says inflate to 44psi, but door frame says 58psi. The van has been over a weighbridge and loading is as follows: Front: 1320kg (1600 max allowed), Rear: 1440 (1600 max). please can you advise optimum tyre pressure for safety and smooth ride for these loads? Thank you

    Bridgestone Response:

    Hello.
    For the axle weights stated, the optimal pressure would be 57psi (based on 1400kg front and 1500kg rear)

    Kind regards
    BSUK Tech Dept

    So there we go. Looks like i am spending another 20p to fill them up again. This hobby is all spend spend spend :Rofl1:

    David
     
    • Like Like x 1
  16. motor roamin

    motor roamin Funster

    Joined:
    May 23, 2010
    Messages:
    1,535
    Likes Received:
    785
    Location:
    Leicester
    Correct that is why Ford are facing so many law suits in America over their Explorer model keeps turning over at speed, down to them giving wrong tyre pressures in the hand book to improve ride quality.

    It could be that the hand book given with a motor home is the base vehicle before a body was put on it which of course would also be a lower pressure.

    you wouldn't chuckle would you

    All the best Rick
     
  17. GJH

    GJH Funster Life Member

    Joined:
    Aug 20, 2007
    Messages:
    27,237
    Likes Received:
    34,454
    Location:
    Acklam, Teesside, originally Glossop
    In my case it is the Explorer handbooks as mentioned in my post last night (18:51) so more than the base vehicle.
     
  18. DBSilverfox

    DBSilverfox Read Only Funster

    Joined:
    May 13, 2010
    Messages:
    592
    Likes Received:
    98
    Location:
    Nottingham
    Hi Graham, yep that is the same manual I have. It makes no sense to me at all.

    the difference between 44 and 57 is such a lot that it would seem that following the wrong advice could be dangerous. I might phone or email Explorer/Elddis/whoever to get an explanation. nothing to lose other than my patience...

    David
     
  19. GJH

    GJH Funster Life Member

    Joined:
    Aug 20, 2007
    Messages:
    27,237
    Likes Received:
    34,454
    Location:
    Acklam, Teesside, originally Glossop
    Good idea David - save me doing it :Wink:
     
  20. DBSilverfox

    DBSilverfox Read Only Funster

    Joined:
    May 13, 2010
    Messages:
    592
    Likes Received:
    98
    Location:
    Nottingham
    And the response from Elddis is "we would always say to go by the handbook".

    OK decision made. Graham, if you have been running on 44psi safely, and if I think the ride feels smoother at 44 than at 57 (which it is) then I am leaving them at 44. Please update me if you have a blowout before I do though :Wink: :Rofl1:

    David
     
Loading...
Similar Threads
  1. Bart
    Replies:
    60
    Views:
    1,926
  2. Jagtazman
    Replies:
    26
    Views:
    1,116
  3. 2bob
    Replies:
    1
    Views:
    397
  4. Shrimp64
    Replies:
    29
    Views:
    1,025
  5. Big Nick
    Replies:
    3
    Views:
    490

Share This Page