Motorhome Weight

There are tyre pressure charts (for MHs) on the internet if you can find them via Google.

Would post an image but this is the CC forum!

PS. It won't take too long before all those little things you didn't know you had will bring the weight up!

Thanks EJB but I have the Continental charts, however, they don't cover the situation of a large difference between front and rear axles.

I will allow 10% contingency in our body weights for the additional wine, cheese and croissants!

hitch, continental need to know the exact tyre size....i have their responses somewhere (your weights are pretty close to mine 1600 front, 1820 rear, 3420 total) but i reckon our 225/75 R 16 CP 116R tyres will be bigger than yours (no offense.) so cant say that pressures will be the same for a similar loaded 15" tyre...

for info, ours came back as 3.0 bar, 43.5psi front, 3.75 bar, 54.3psi rear. 

as you can see, 5 and 5.5 bar seems pretty high and you could easily lose a fair chunk of this...

BB How did you overcome the Fiat TPMS from activating with such low pressures?  We tried to lower ours per Michelin advice to 65psi front and 80psi rear but the TPMS activated in the cold.

If it's the same as the Peugeot I believe that it can't be changed so you have to live with a continuous warning signal on the dash.

Thanks BB. I have the chart from Continental for the exact tyres but it doesn't really cover the big load difference. I have emailed them.

Michael and Hitch, (Lilo and Stitch).....sorry, moules frites and a nice crisp white in the lovely evening sunshine and it just came into my head......

we dont have TPMS on our van, not even sure ive seen it on the options list for either of our Carthagos...perhaps they have sussed that it might be an issue for owners due to the huge difference between dealer 'assumptions' and tyre manufacturers 'knowledge'....

im glad i don't have to think of a way to 'fool' it....good luck, guys.

Hitch, i dont think ypu need to worry too much about the 'difference' per se....they will hive you one  figure for ypur front axle and then another for the rear axle....(the only rider being whether you have a twin wheeled axle or a single one.....we (three) all have a single wheeled rear axle so the normal figure should apply

BB It may not be apparent that you have TPMS but check the dash lights and you may have a yellow light that looks like a flat tyre like this link. I believe you have to get Fiat to adjust it to your pressures, I have reset mine back to Michelin recommended and so far the light has stayed off, it seemed to be the cold that triggered the warning.

http://www.fiatia.com/fman-320.html

ill check the dash bit no yellow lights so far....

This is a reply given to a MHFacts member a few years ago - the weights are similar to yours, and also my MH, and I run the pressures as he advised -

'Last Sunday, I emailed Continental Tyres to ask what my tyre pressures should be. I offered the relevant tyre details... Fiat Ducato, X2/50, tyres information: 215/70 R 15 CP 109R

I included my axle weights which resulted from my last visit to a weighbridge... Yes, I do take my own advice!

Rear axle - 1900kg (max 2000)
Front axle - 1540kg (max 1850)
Gross - 3440 kg (max 3500)

The following is the reply from Craig, the Product Support Engineer of Continental Automobil. He has consented to having his reply published on MHF:

The pressures you require are as follows:

Front: 3.25bar - 47psi pressure applicable to a maximum permissible load of1590kg. 1850kg Max loading at 4bar - 58psi (1875kg maximum at this pressure)

Rear: 4.25bar - 61psi pressure applicable to a maximum permissible load of1970kg. 2000kg Max loading at 4.5bar - 65psi (2060kg maximum at this pressure)

As a general rule for pressures on this tyre, every 100kg added from the base figure of 1490kg at 3bar (43.5psi) will require an increase of 0.25bar(3.6psi) in pressure up to a maximum of 2060kg at 4.5bar (65psi)

We do get a substantial amount of queries regarding pressures. Unfortunately, there is a distinct lack of understanding on the subject which isn't helped by the apparent reluctance of coach-builders to specify the pressures required. Naturally, all pressures are dependent on load so providing any queries received contain the information requested, we can advise accordingly. I've helped a few other organisers of motorhome/camping clubs and associations in the past so we are all working to educating the consumers as to what is required. Hopefully this will provide a greater understanding for them.' 

K&M, good stuff and, yet again, a mile away from the 80psi all round pumped in by the (most) converters.

no wonder folk feel the difference with the correct pressures

...just have to fool (or ignore) that pesky TPMS