Tyre Pressures

[Sharon the Cat]

New Rimor on a Fiat Ducato base.

Plate says 79 psi, tyres say 69 psi.

Hmmmm?

 

[andyjanet]

79 is a bit hard,
I would go with 70 and see how it feels,
I’ve dropped mine to 60 only to stop the rattling from all the lockers

 

[TJBi]

What does the tyre company (provided its not Michelin) say based on your actual axle weights when loaded?

 

[Robmac]

Ask Barry.

He'll only charge a small consultancy fee.

 

[barryd]

Another tyre pressure thread!!!!!!

 

[Sharon the Cat]

79 is a bit hard,
I would go with 70 and see how it feels,
I’ve dropped mine to 60 only to stop the rattling from all the lockers

Hi Andy, so does the tyre rating count for anything?

 

[Sharon the Cat]

What does the tyre company (provided its not Michelin) say based on your actual axle weights when loaded?

That will take some homework, thanks.

 

[Sharon the Cat]

Another tyre pressure thread!!!!!!

You wouldn't have been posting that for a toilet thread, would you?

 

[barryd]

You wouldn't have been posting that for a toilet thread, would you?

I might! Rock n Roll!!

 

[marchie]

New Rimor on a Fiat Ducato base.

Plate says 79 psi, tyres say 69 psi.

Hmmmm?

Burstner say 79psi all round. I use 65psi on the front axle, and 75psi on the rear for the last 3 years+ on Winter Tyres all year. The ride is a little firm, but the tread wear has been uniform, and the strengthened tyre walls give a sensible level of support and protection over the potholes that pass for UK roads.

Steve

 

[andyjanet]

The tyre pressure written on the side wall is a general recommended pressure for an average vehicle,
With a Moho being heavier the tyre pressures are usually higher and a Moho has harder tyre walls to support the increased weight,
Tyre pressures are a balancing act ,
Too hard and the middle of tyre wears out before the outsides and your teeth wear out because of the rattles and jarring.
Too soft and the tyre wears on the outsides and not the middle of the tread Also the vehicle feels soft and wallowy when cornering,
I look at the recommended pressure which is usually too hard for me and then drop it by 5 psi a couple of times until it feels about ok then keep an eye on the tyre tread for undue wear over a few months , if the tyre is still wearing evenly and it doesn’t feel squashy when driving hard then I’m somewhere right with pressures

 

[Canalsman]

The tyre pressure written on the side wall is a general recommended pressure for an average vehicle,

Sorry Andy but that's not correct.

The value to which you refer is Max Pressure. This is a value that is required to be given to meet USA requirements. It is not a guide to the inflation pressure for any vehicle. The pressure is determined by the axle loading as determined on a weighbridge and reference thereafter to the tyre manufacturer or as calculated by Tyresafe:

Motorhome Tyre Pressure Calculator | TyreSafe

Our motorhome tyre pressure calculator gives you the correct pressures for your motorhome. Check your tyres regularly for your safety.

www.tyresafe.org

Or the website here:

Motorhome Tyre Load and Inflation Tables | TyreSafe

The correct inflation pressures for your motorhome's tyres are extremely important. Here is some information to help with your motorhome tyre pressure

www.tyresafe.org

 

[Wooie1958]

Burstner say 79psi all round. I use 65psi on the front axle, and 75psi on the rear for the last 3 years+ on Winter Tyres all year. The ride is a little firm, but the tread wear has been uniform, and the strengthened tyre walls give a sensible level of support and protection over the potholes that pass for UK roads.

Steve

As others have said lowering the pressures will give a smoother ride but Steve hasalso pointed out the important bit which i have highlighted bold.

Lowering them too much will result in swaying / wayward handling and greater tyre wear on the inside and outside edges of the tyres.

 

[andyjanet]

Thanks chris, i stand corrected , first time this century i think

 

[Sharon the Cat]

Sorry Andy but that's not correct.

The value to which you refer is Max Pressure. This is a value that is required to be given to meet USA requirements. It is not a guide to the inflation pressure for any vehicle. The pressure is determined by the axle loading as determined on a weighbridge and reference thereafter to the tyre manufacturer or as calculated by Tyresafe:

Motorhome Tyre Pressure Calculator | TyreSafe

Our motorhome tyre pressure calculator gives you the correct pressures for your motorhome. Check your tyres regularly for your safety.

www.tyresafe.org

Or the website here:

Motorhome Tyre Load and Inflation Tables | TyreSafe

The correct inflation pressures for your motorhome's tyres are extremely important. Here is some information to help with your motorhome tyre pressure

www.tyresafe.org

We've just used this thanks.


Suggested cold tyre inflation pressure:
Front Axle :
64
psi /
4.4
bar
Rear Axle :
80
psi /
5.5
bar
Do not exceed the maximum cold inflation pressure marked on the tyre sidewall.

 

[andyjanet]

So the tyres say maximum inflation is 69 psi and the website is saying 80 psi!
No wonder things go wrong in this world

 

[Sharon the Cat]

So the tyres say maximum inflation is 69 psi and the website is saying 80 psi!
No wonder things go wrong in this world

The website doesn't ask for the make.
But, having said that, I have no idea what all the numbers and letters on the tyre mean. Apart from m i c h e l i n of course!

 

[molly 2]

Just out of interest what brand n type are the tyres , my autosleeper has vanco camping tyres front 70 psi rear 80 psi .as stated on the tyre pressure plate so that is what I use ,

 

[barryd]

Just out of interest what brand n type are the tyres , my autosleeper has vanco camping tyres front 70 psi rear 80 psi .as stated on the tyre pressure plate so that is what I use ,

Not that I want to get involved in another tyre thread but from my own epic thread it seems with the Vanco tyres at least which I have whats written on the wall of the tyre is the "max" pressure if your van is running at full weight. Conti can provide the recommended pressure for your "actual" axle loads.

 

[Robmac]

The website doesn't ask for the make.
But, having said that, I have no idea what all the numbers and letters on the tyre mean. Apart from m i c h e l i n of course!

Of course Sharon, that should be followed by the tyre pressure needed after visiting a posh restaurant.