Tyre pressure what a difference a weighbridge makes

Discussion in 'Tech/Mech General' started by dencol, Apr 14, 2010.

  1. dencol

    dencol Read Only Funster

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    Bought my van just over 2 years ago, only 18 month old and very low mileage. Been very happy in general but not with the handling, lot of road noise, light on the steering but a ‘hard’ ride, to be honest I have never felt comfortable with the handling, surprising as it is only a medium wheel based van conversion assumed it was my lack of experience and more susceptible to the wind (the van that is not me:BigGrin:)

    Last week noticed the side wall of a front tyre was cracked so off to the local tyre garage who found both front tyre had sidewall cracks so two new front tyres:cry:. Speaking to the owner he only had experience of caravans not motorhomes but suggested that the cracks could be from the van been left parked for long periods of time at some point, also had heard of ‘flat spots’ causing some handling difficulties, also was not happy with the recommended tyre pressure in the manual and on the door pillar of 60 Ib.

    On leaving the garage immediately noticed the difference, low road noise, responsive steering, much better handling:thumb:. So off to a weighbridge fully loaded to check axle loads.
    Armed with the axle weights contacted Avon tyre to check their recommended tyre pressure. Their calculation

    43lb in front and 47lb rear. So not much difference to the 60 lb then

    colin
     
  2. American Dream

    American Dream Read Only Funster

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    Cheers Colin.

    So....How do you get to use a weighbridge?

    I have seen vehicles pulled over by the police for "Random" weighing but never used one before.

    Can you just turn up? 60 psi would certainly explain some sidewall cracking together with the ageing process of the rubber...


    Steve.
     
  3. green machine

    green machine Read Only Funster

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    Tyre Pressures

    Hi Dencol :Smile:

    I am having the same problems with my tyres. I have just replaced all fours with Avons. My first trip out was very different from before and was very noisey and felt hard (vibration) What is your axle weight fully loaded. I posted a message and was advised that I should put 65 in front and back, But the guy at the garage said the pressure should be 45 front & 50 rear. I have 65 all round at the moment.

    Any help would be greatly apprieciated

    Green Machine
     
  4. GJH

    GJH Funster Life Member

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    Have a look in your local Yellow Pages Steve and just give the places listed a ring. If nothing listed try your local council.

    We used a local company - they just told us to turn up when we wanted to. That company charged about £12 for a certificate with the weights on and about half that for the weights written on plain paper (which was all we needed).

    Graham
     
  5. GJH

    GJH Funster Life Member

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    Pappajohn uploaded a Motorhome Tyre Safety Leaflet. Contains all you need to know, including pressures. It's available from the Downloads section Here.

    Graham
     
  6. SIFTA SAM

    SIFTA SAM Read Only Funster

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    I just turn-up at the local (large) builders yard, drive on, get weighed, pay £2.50p and drive off with the print-out!
     
  7. paulmold

    paulmold Read Only Funster

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    In answer to 'how do I use weighbidge'-

    I contact my local council and was given the addresses of the landfill sites where they have weighbridges to weigh the refuse lorries before they unload. I just rolled up asked the operator what to do, he asked if I wanted a verbal or printed figure, charged me a fiver for printed sheet.
     
    Last edited: Apr 14, 2010
  8. geoff1947

    geoff1947 Read Only Funster

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    Weighbridge

    I called the council and they gave me names etc of local weighbridges Quite surprised to see so many around Plymouth Called them, turned up paid £5 and had job done and with 3 certificates issued Really worth it as I found I was over loaded on rear axle by 50lb, Dumped blue water and all ok for my trip to Spain!!
    :thumb:
     
  9. hilldweller

    hilldweller Funster Life Member

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    You are in a no win situation there. Assume a blow out. Police measure pressures. They read 43 your door says 60.

    Where does that leave you with the Police and insurers ?
     
  10. Robinhood

    Robinhood Read Only Funster

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    On direct advice from Michelin, I'm running my tyres at well below the sticker/handbook pressure, and have done for the last 6 years or so. Both handling and ride improved dramatically.

    I did make sure that I got written confirmation by email, such that I have evidence should I need it.

    Frankly, given the history of nearly ALL tyre manufacturers recommending motorhome tyre pressures significantly lower than the vehicle manufacturer, the clear guidelines for motorhomes available on the British Tyre Manufacturers Association website, and the specific recommendation from the tyre manufacturer for my particular type of vehicle and axle loadings, I'd be quite prepared to fight it out with both the police, and my insurance company.

    Given the background, I would expect there to be no contest, but I wouldn't expect either of them to pursue things in the first instance.

    And I could argue with all my fillings intact. :Laughing:
     
  11. GJH

    GJH Funster Life Member

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    The specification from Elddis gives our pressures as 44 psi, which agrees with the motorhome tyre safety leaflet. Any query and I would point to that rather than the door sticker put on by Peugeot who had no idea at the time what the vehicle would be used for.

    Graham
     
  12. dencol

    dencol Read Only Funster

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    Hi
    I emailed the local council who gave me an out of date list? but also the contact number for the weighbridge at the local tip. Suggest try local council. When I rang the tip they could not be more helpful and suggested quiet times and on arrival told them I wanted total and individual axle weights. They then provided a print out, only problem they do not have change / cash till so worth checking price and having the correct money with you.

    Re the difference in pressures to the door plate. Have made a few enquiries including local traffic department. Would appear that the plate shows manufacturers initial recommendation based on their idea of the vans use. It was 'suggested' that I carry original (or copy) of the weighbridge ticket and emails from company showing their calculation / recommendation for the type of tyres and weight this will prove I have taken all reasonable steps and would be acceptable.

    Before going to the weighbridge I did load up everything I would need for a weeks holiday including full tank of fuel, 3/4 full tank of water, 1/4 tank waste water and 1/2 full toilet cassette.

    I did also find that Avon tyres website had a spreadsheet giving tyre pressures based on weights so downloaded this as well in case stopped.

    One thing that did suprise me was when I checked the plate re vehicle weights (mine is under the bonnet by the water filler cap). Peugeot had the vehicle plated at 2900kg but Autosleeper had replated at 3300kg yet the log book shows 3.5ton. I am well under for autosleepers plate but would have been overweight on the original plate.

    Colin
     
  13. nicholsong

    nicholsong Read Only Funster

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    My local council tip charge nothing for a 'verbal', but they scribble it on a scrap of paper. What is a print-out worth anyway, because the next trip you may be loaded very differently.

    As for getting axle weights, drive front axle on, let them note weight , drive both axles on, note weight, then rear axle is total minus front, saves time when they are doing it for free. Also if there are paying customers around I would always offer to wait for a gap in traffic-only polite and keeps the system free in both senses.

    Geoff
     
  14. 747

    747 Read Only Funster

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    A big cause of sidewall cracking is sunlight breking down the compound. If you are always parked in the same position, it is worth cutting some 6mm ply and shielding your tyres.

    If your van is not being used much, there is no harm in putting an extra 5 to 10 lbs of pressure in the tyres to prevent flat spots or didtortion.

    The only gauranteed way of getting the correct tyre pressures is to weigh the van and ask the manufacturers. I found this out the hard way. My Elddis Autoquest had 80 psi in all tyres and was a death trap to drive. The Explorer Group website said the pressure should be in the 40`s psi. This was way too soft and just as dangerous. I weighed the van and contacted Michelin and got the figure of 55 psi which made a huge difference.

    Remember that the wrong tyre pressures can have a big affect on MPG also.

    Just make sure your van is fully laden when getting it weighed.
     
  15. TonyIsh UK

    TonyIsh UK Read Only Funster

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    For those passing using the A23 Sussex Nr Handcross, there is a free weigh bridge on the north bound lane of the A23.

    Pull off A23 (north bound lane) into Handcross, The weighbridge is immediately in front of you.

    Stop by the sign,

    Press Button, large sign will tell you when ready to go.

    Drive first axle onto balance plates, Sign will display load,

    Drive second axle. ditto.

    Drive off and sign will give total weight (both axles added together)

    To check again, you will have to reverse back through the station (not difficult) otherwise its a round trip to Peas Pottage, down to Bolney and up the A23 again !!

    Rgds
     
  16. pappajohn

    pappajohn Funster Life Member

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    here you go steve.....knock yer self out choosing one

    weighbridge list
     
  17. Minxy Girl

    Minxy Girl Funster Life Member

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    For anyone going near the Humber Bridge there's a weighbridge immediately before you go onto the bridge from the north, it's located on the left before the toll boths, looks like a lay-by. You just go into the layby and read the info, press the button and do as it says. You can then drive off and cross through the central reservation to go back in a northerly direction if you're not wanting to cross the bridge. Easy peasy - I'd only recommend going at a weekend or evening though as it is in use during the day by VOSA so you won't get on it ... not willingly anyway!!!:Eeek:
     
  18. Mastodon

    Mastodon Read Only Funster

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    I use the Yorks Trading Standards weighbridge in Morley (W Leeds) open 24/7, just roll over it and write down the numbers. We always check with water and fuel full so we know the worst case...
     
  19. American Dream

    American Dream Read Only Funster

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    Hi Hilldweller,

    Couldn't you just produce the weighbridge pressures and data from the tyre manufacturers?

    The tyres could have already been stressed by the previous higher pressures causing a possible delamination of tread or "blow-out".We had one go because of this....It wasn't too old either...

    I'd like to think the Tyre manufacturers loading and pressure data is more accurate than a figure on the door pillar?

    BTW what are the pressures on a garage inflation data sheet for the "van"?

    Steve.

    Thanks all for answering my question about weigh bridges.:thumb:
     
  20. hilldweller

    hilldweller Funster Life Member

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    I'm playing devil's advocate in this barmy world.

    Remember we are EU now and *everything* is CE regulated and certified. So if the vehicle makers says 5.1 bar and the tyre maker says 4.5 bar where do you stand ? The tyre maker did not certify the vehicle.

    You may even be using illegal tyres if the manufacturer stated Pirelli ( as any good Italian would ) and you fit Avons.

    It's a nightmare.

    The blow out could be caused by debris on the road, so no use thinking it can't happen because the tyre maker is correct.

    Ours run at 72psi, when we took delivery (SH) they were well down, pumping them up improved the handling no end. The Michelin carcass says 80 psi max.

    So the bottom line whatever you do is get all the documentation printed off stored, you may need it, badly.
     
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