Tyre Pressures

Pressure calculation table

 
 
 
 
 
 
Davy
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Tyre Pressures

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Posted: 03.09.2017  ·  #1
Tyresafe the organisation who promote advice on tyres have revamped their advice for Motorhome pressures.

Simply input your axle weights, or if you haven't been to a weighbridge, the rated axle maximum loads.

https://www.tyresafe.org/check-your-pressures/motorhomes/

I think this post or the link should go into the Lexikon as a permanent reference.

Davy


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Re: Tyre Pressures

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Posted: 03.09.2017  ·  #2
On ford transit ( 2006-2014) the axel weight badge is located under the bonnet on the cross member in front of radiator beside the bonnet latch.
There is also a tyre sizing and pressure sticker located on the cab pillar beside the door latch.
A very quick database could be built if other vehicle owners posted similar info.
Rear tyre pressures will be higher due a heavier load than front axels


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Re: Tyre Pressures

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Posted: 03.09.2017  ·  #3
Quote by Davy



I think this post or the link should go into the Lexikon as a permanent reference.

Davy


Agree.

I have just added the category 'Mechanical & Technical' you should be able to add it yourself Davy.


Davy
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Re: Tyre Pressures

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Posted: 03.09.2017  ·  #4
Rewritten and posted. It is one of those perennial topics which people ask so hopefully it will be useful.

As an interesting additional point, it would appear that anyone who uses CP tyres (camper specific) should have the rear tyres inflated to 80psi irrespective of axle load. I did not find an explanation for why, but it seems to be almost mandatory. I wonder is it the case that the sidewalls being of a bigger number of ply are not designed to flex as much. Any one got any knowledge on this?

Davy


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Re: Tyre Pressures

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Posted: 03.09.2017  ·  #5
80psi is too hard in my ducato (3850kgs) it sends every bump up through the MH


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Re: Tyre Pressures

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Posted: 16.09.2017  ·  #6
Several years ago I got new Michelin camper tyres, and I emailed Michelin and was advised that the pressure for the back tyres is always 80psi. From my discussions I got the impression that this figure was what they deemed to be best practise for the strong sided camper tyres.
Franco


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Re: Tyre Pressures

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Posted: 16.09.2017  ·  #7
Personal I would go with the MH manufacturers recommendations as they are the end vehicle producer not the base vehicle manufacturer. However with bodybuilder type approval on the scene since 2012, the info sticker/plate should be MH revalant.


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Re: Tyre Pressures

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Posted: 23.12.2017  ·  #8
I run my MH. 4500kg tag axle at 80psi no problems. Had to buy a special tyre pressure gauge as the usual ones wouldn’t go up to 80psi


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Re: Tyre Pressures

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Posted: 27.12.2017  ·  #9
Quote by TommyS

I run my MH. 4500kg tag axle at 80psi no problems. Had to buy a special tyre pressure gauge as the usual ones wouldn’t go up to 80psi


information contained in the AL-KO manual

For the MC45XTA and the MC35XTAM chassis the stated cold pressures, empty and fully loaded are:

205/75R16C (110/108Q) front: 4.5 bar/65 psi rear: 4.0 bar/58 psi
215/75R16C (113/111Q) front: 4.5 bar/65 psi rear: 3.5 bar/50.8 psi
215/75R16C (113/111Q) Camping front: 5.5 bar/79.8 psi rear: 3.5 bar/50.8 psi


nilrac
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Re: Tyre Pressures

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Posted: 27.12.2017  ·  #10
This is a minefield e.g. how heavy of a load, what roads are you running on, high speed motorway.or local A class and, at what speed etc etc. also what make of tyre, If you are like me on Michelin camping and at the front you have 5.5 bar and the back pressure can be determined by using any weighbridge ,Fully load and weigh the whole van and then the front only ,then after subtracting one from the other you will see what the back is carrying.,If the rear axle is lighter than the front axle you can reduce the pressure to make the ride softer. I keep mine both about the same as I do long distance and want the best fuel returns. Under inflated tyres cause drag and therefore cost you money, This is for two axle vehicle for three its depending on the tandem rating.


Thorn123
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Re: Tyre Pressures

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Posted: 28.12.2017  ·  #11
If your vehicle is rated for 3500kg or more, the valve stems in rim must be steel not rubber regardless of the tyre pressure used. This is causing problems for folks who have alloy rims.


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Re: Tyre Pressures

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Posted: 28.12.2017  ·  #12
To my mind the potential problems with alloy wheels on a camper outweigh the benefits. The vast majority of HGVs use steel wheels for good reason, the only vehicles that have alloys as standard are cars which aren't subject to the same loads as Campers or Vans.
I have 225/75-16 Continental Vanco Camper CP tyres and the info on the B pillar says 5.5 bar or 79.5Psi
They can run at lower pressures but only if you know with certainty the actual loads being carried by weighing.
If in doubt just run at the recommended pressures.


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Re: Tyre Pressures

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Posted: 28.12.2017  ·  #13
It's not very easy to get metal valves for alloys as there's different types and tyre fitters aren't interested


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Re: Tyre Pressures

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Posted: 28.12.2017  ·  #14
Lots of motorhome manufacturers send their new vans out with alloy wheels so these are fit for purpose,they are also fitted with steel type valves if necessary so they are available. If some individual devices to change from standard steel wheels then they must check the load rating of the alloys that they are going to fit as car type alloys are not suitable.


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