What tyre pressure (again)

[ontheroadagain]

I weighed our motorhome today
Adria Compact SC plated at 3500kg.
Fully loaded for 4 days away.
Full water (140L)
Full diesel
Michelin 225x75R16 CP 116
Front 1610kg
Rear 1870kg
Total 3480kg (that was close!)
I understand that unlike Continental, Michelin won’t advise or if they do they will always say 80psi for the rear.
I think I should be ok with 50 front and 65 rear based on info from other tyre manufacturers.

 

[Bobby-gg]

Have you checked your weight against your tyre size here?

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

 

[ontheroadagain]

Have you checked your weight against your tyre size here?

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

Yes but it always gives 80psi on rear regardless of loading.

 

[funflair]

I would go 52 or 55 front and 65 rear.

I just use the calculation actual axle weight divided by maximum axle weight for tyres x maximum pressure, so front 1610/2500x80 = 51.5 psi then you can round it up on the steering axle so 55, on the same basis the rear comes out at 60 psi so 60 or 65

This is just my rule of thumb based on nothing but it does seem to tally with Continental tyre charts when I double check.

 

[Falcon 269]

I ran our details through the calculator and got recommended pressures of 65 rear/ 62 front.

Then noticed this small print: CP-type tyre construction enables the use of higher inflation pressures to provide resistance to the difficult conditions of use encountered on motorhomes. Therefore, when CP-type tyres are fitted on the rear axle in a single formation set the inflation pressures to 5.5 bar (80 psi) for all loads.

Since we have Conti Camper tyres, I'm assuming this means we should be running 80psi in the rear as per the small print. Which is what we do.

Just thought it worth pointing out.

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[Jamesh]

50 / 60psi is plenty imho.

Iirc thats what our work sprinters ran at...

 

[Yorick]

It's funny that tyre manufacturers know bugger all about tyre pressures

 

[Lenny HB]

I weighed our motorhome today
Adria Compact SC plated at 3500kg.
Fully loaded for 4 days away.
Full water (140L)
Full diesel
Michelin 225x75R16 CP 116
Front 1610kg
Rear 1870kg
Total 3480kg (that was close!)
I understand that unlike Continental, Michelin won’t advise or if they do they will always say 80psi for the rear.
I think I should be ok with 50 front and 65 rear based on info from other tyre manufacturers.

Sounds about right to me.
We don't have CP tyres but run the front at 56 (1930kg) & rear 69(2300kg).

 

[funflair]

I ran our details through the calculator and got recommended pressures of 65 rear/ 62 front.

Then noticed this small print: CP-type tyre construction enables the use of higher inflation pressures to provide resistance to the difficult conditions of use encountered on motorhomes. Therefore, when CP-type tyres are fitted on the rear axle in a single formation set the inflation pressures to 5.5 bar (80 psi) for all loads.

Since we have Conti Camper tyres, I'm assuming this means we should be running 80psi in the rear as per the small print. Which is what we do.

Just thought it worth pointing out.

I have not seen anywhere that Continental say that their Camper tyre should run at 80 on the rear axle, but I could be wrong a lot of people run Continental over Michelin for that very reason.

 

[Mr Colpot]

We have just had Continental Camper tyres fitted and a Continental letter sent to another Motorhomer says 58 front and 69 rear for the weight I run at. Much better ride home.

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[TheTwoOfUs]

I weighed our motorhome today
Adria Compact SC plated at 3500kg.
Fully loaded for 4 days away.
Full water (140L)
Full diesel
Michelin 225x75R16 CP 116
Front 1610kg
Rear 1870kg
Total 3480kg (that was close!)
I understand that unlike Continental, Michelin won’t advise or if they do they will always say 80psi for the rear.
I think I should be ok with 50 front and 65 rear based on info from other tyre manufacturers.

I’m sure that you’ve already checked that your front axle is not overloaded but what is the max given for it on the weight plate?

 

[cyberyacht]

I've got Michelin Campers and the same axle weights as the OP. I've hedged my bets and reduced the pressures to 70/75. Seems reasonably comfortable. I'll be putting new tyres on next year, probably Conti All Seasons.

 

[peterc10]

I ran our details through the calculator and got recommended pressures of 65 rear/ 62 front.

Then noticed this small print: CP-type tyre construction enables the use of higher inflation pressures to provide resistance to the difficult conditions of use encountered on motorhomes. Therefore, when CP-type tyres are fitted on the rear axle in a single formation set the inflation pressures to 5.5 bar (80 psi) for all loads.

Since we have Conti Camper tyres, I'm assuming this means we should be running 80psi in the rear as per the small print. Which is what we do.

Just thought it worth pointing out.

Continental will tell you what their recommended pressures should be if you give them your actual axle weights and size and type of tyre.