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Brenda Glanfield

Free Member
Jan 31, 2016
16
2
Birmingham
Funster No
41,525
MH
Autosleeper
Exp
I'm a newbie
Hi everyone,
I am new to motor homes and everything is slightly daunting at present. I am just about to embark on my first trip and am keen to do all the safety checks before I go.
Although I have lots of information on my Autosleeper, the advice on tyre pressure seem is to differ greatly.
Anyone advise?
 

Bacchus

Free Member
Jul 27, 2015
412
4,236
Staines
Funster No
37,318
MH
A Class Hymer
Exp
since 2011
I am sure someone with autosleeper knowledge will be along to help shortly, but I run my old Hymer on about 65 psi if that's any use...
 
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Brenda Glanfield

Free Member
Jan 31, 2016
16
2
Birmingham
Funster No
41,525
MH
Autosleeper
Exp
I'm a newbie
Thank you. Handwritten notes that came with the van suggest 44 psi, but that seemed a bit low.

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Bacchus

Free Member
Jul 27, 2015
412
4,236
Staines
Funster No
37,318
MH
A Class Hymer
Exp
since 2011
I have just had a quick google around and the answer does seem to vary between 44/50 (front/rear) and 60/65.

the tyres will probably wear quicker at lower pressures but will require higher pressures if you are heavily loaded.

Sorry that's not a definitive answer but there does seem to be an element of personal preference!
 
May 21, 2008
4,244
7,262
Oxford
Funster No
2,767
MH
WildAx Constellation
Exp
Since 2008
Phone Autosleeper and ask them, they are very helpful. You may need to specify the year, and somewhere in the van you will find an Autosleeper number which will identify the van. Mine was in the glove compartment.
 

Puddleduck

LIFE MEMBER
Jan 15, 2014
12,357
43,865
Scottish Borders
Funster No
29,703
MH
Without at present
Exp
On and off for many years.
It will also depend on weight and the type of tyre.

We weighed ours and sent the weights to Continental who advised the correct pressure - rather lower than the FIAT tyre pressure sticker but a much better ride with the Continental pressures.
 
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Apr 10, 2010
548
538
Bedfordshire
Funster No
10,998
MH
Carthago
Exp
Since Sept 2003
Measure the load on each axle (L). Find out the load rating of the tyres from the code on the side wall (R). Find the maximum pressure of the tyres, also from the side wall (MP).

The tyre pressures to run at (P) = L divided by R times MP.

When I've used this formula it has always been bang on what Continental advised.

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Charlie

Free Member
May 16, 2015
3,211
3,639
Herefordshire / Worcestershire borders .
Funster No
36,385
MH
Auto Sleeper Kemerton.
Exp
Im a newbie
It will also depend on weight and the type of tyre.

We weighed ours and sent the weights to Continental who advised the correct pressure - rather lower than the FIAT tyre pressure sticker but a much better ride with the Continental pressures.

Continental may advise on the basis that the van is a chassis cab or van if. PVC.

So they may give a pressure for all round all weight use or an average of. A motor home is in most cases that chassis or PVC fully loaded all of the time which would result in higher pressures needed. .

Running incorrect pressures can result in overheating. We should increase the pressures on even our cars if carrying more than one passenger for most of the time.

Auto sleeper recommend 65 rear 60 front based on the fact the PVC in this case a Symbol is in fact a fully loaded van very nearly all of the time.
 

Puddleduck

LIFE MEMBER
Jan 15, 2014
12,357
43,865
Scottish Borders
Funster No
29,703
MH
Without at present
Exp
On and off for many years.
Continental will want to know the axle weights you run at and will give you the pressures appropriate to those weights and the tyres fitted.

That's what I sent them along with the details of the tyres fitted and told them that it was a motorhome. They were very helpful, gave their recommended pressures / temperatures (we have tyrepal) and all is good.

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Charlie

Free Member
May 16, 2015
3,211
3,639
Herefordshire / Worcestershire borders .
Funster No
36,385
MH
Auto Sleeper Kemerton.
Exp
Im a newbie
Continental will want to know the axle weights you run at and will give you the pressures appropriate to those weights and the tyres fitted.
So long as they take in the vehicle will be fully loaded most of the time then fine.

Take a Peugeot van. 3500 GVW but that van will be at max load for only some of the time. The works vans we have are hardly ever loaded above a third of the possible weight carrying capacity. If they were fully laden the tyre pressures would need to be far higher.

The same van converted into a motor home is quite different .

If the tyre manufacturers are in full posesion of the info they will likely draw the same conclusion as Auto Sleeper and set them 65/60 as AS do.

AS are in full posesion of the facts as they build the vehicles. Personally I go with the vehicle builders .
 
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DBK

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Jan 9, 2013
17,969
47,804
Plympton, Devon
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2013
So long as they take in the vehicle will be fully loaded most of the time then fine.

Take a Peugeot van. 3500 GVW but that van will be at max load for only some of the time. The works vans we have are hardly ever loaded above a third of the possible weight carrying capacity. If they were fully laden the tyre pressures would need to be far higher.

If the tyre manufacturers are in full posesion of the info they will likely draw the same conclusion as Auto Sleeper and set them 65/60 as AS do.

AS are in full posesion of the facts as they build the vehicles. Personally I go with the vehicle builders .
I don't agree, the vehicle manufacturer can only give general recommendations which in the case of Fiat seem to be very high pressures. The tyre manufacturer, if they know the axle load, which will reflect precisely the loading on the tyre, should know the best pressure to run them at. However, the only manufacturer who seems to make this advice readily available is Continental but other manufacturers should respond if asked.

The pressures shown on sidewalls are the maximums and in most cases you can run at much lower pressures perfectly safely, but of course it really does depend on the axle loads and unless you take your vehicle to a weighbridge you won't know what those are.

I've now done around 10K miles on mine running them at 3 bar front, 3.25 bar rear on a 3.5t PVC with Continental Vanco Four Season tyres. There is no sign of uneven wearing and they don't overheat. Whenever I take it in for a service I have to let the tyres down afterwards as they blow them up to 5 bar - because that is what the handbook says.

In summary, know your axle weights and then ask the tyre manufacturer. Otherwise, follow the handbook and prepare to replace your fillings regularly. :)
 

Charlie

Free Member
May 16, 2015
3,211
3,639
Herefordshire / Worcestershire borders .
Funster No
36,385
MH
Auto Sleeper Kemerton.
Exp
Im a newbie
I don't agree(y), the vehicle manufacturer can only give general recommendations which in the case of Fiat seem to be very high pressures. The tyre manufacturer, if they know the axle load, which will reflect precisely the loading on the tyre, should know the best pressure to run them at. However, the only manufacturer who seems to make this advice readily available is Continental but other manufacturers should respond if asked.

The pressures shown on sidewalls are the maximums and in most cases you can run at much lower pressures perfectly safely, but of course it really does depend on the axle loads and unless you take your vehicle to a weighbridge you won't know what those are.

I've now done around 10K miles on mine running them at 3 bar front, 3.25 bar rear on a 3.5t PVC with Continental Vanco Four Season tyres. There is no sign of uneven wearing and they don't overheat. Whenever I take it in for a service I have to let the tyres down afterwards as they blow them up to 5 bar - because that is what the handbook says.

In summary, know your axle weights and then ask the tyre manufacturer. Otherwise, follow the handbook and prepare to replace your fillings regularly. :)

I'm not saying eithe vehicle builder or tyre maker is wrong or right merely that the vehicle builder will know the real weight of the vehicle and that it is at that weight most of the time.

It could be I am by taking note of AS am running way to high with my pressures.

This my friend is why we debate. (y)

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Apr 10, 2010
548
538
Bedfordshire
Funster No
10,998
MH
Carthago
Exp
Since Sept 2003
My vehicle has just come back from main dealer service with tyre pressures around 62 psi all round. The maximum pressure marked on the tyres is 83 psi (Continental Vanco Four Seasons). The calculation above and Continental give pressures of 58 psi front and 47 psi rears. As DBK says, always let the tyres down after service!

The axle loading you have to use is the one that you run at - in my case fully loaded at 2,100 kg front and 1,800 kg rears.
 
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2

2657

Deleted User
Measure the load on each axle (L). Find out the load rating of the tyres from the code on the side wall (R). Find the maximum pressure of the tyres, also from the side wall (MP).

The tyre pressures to run at (P) = L divided by R times MP.

When I've used this formula it has always been bang on what Continental advised.

What units do you use in this formula, psi/bar.......kg/lbs?
 
Apr 10, 2010
548
538
Bedfordshire
Funster No
10,998
MH
Carthago
Exp
Since Sept 2003
What units do you use in this formula, psi/bar.......kg/lbs?
It doesn't matter as long you're consistent. The tyre load rating is in kg, so I use that, but I often switch between psi and bar.

An example for my front axle: L 2,100 kg; R 2,900 kg; MP 80 psi.
2,100/2,900*80 = 58 psi.

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2

2657

Deleted User
It doesn't matter as long you're consistent. The tyre load rating is in kg, so I use that, but I often switch between psi and bar.

An example for my front axle: L 2,100 kg; R 2,900 kg; MP 80 psi.
2,100/2,900*80 = 58 psi.

Thanks for that, I was going to experiment but you saved me the trouble:)
 
Nov 7, 2009
235
748
Funster No
9,223
apart from all the help on MHF , you could try auto sleeper owners forum
Might be worth a try
Regards

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