What Should My Tyre Pressure Be, Please?

[HKF]

How do I know what my tyre pressure should be, please? Thank you

 

[BouncyBoatFolk]

I suspect to answer the question accurately much more information will be required.
Tyre type?Brand? Axle weights when in running trim? Just as a starter, .
Mike.

 

[funflair]

Really you need to know the axle loadings from a weighing and the tyre load rating, then you can make a decent estimate in my opinion.

 

[Sheddy]

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

This will help if you know the axle loads.

 

[VXman]

It should be somewhere on your vehicle - often on the inside of a door panel when you open the door. Or in the manual.

Typically they can be 79 psi.

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[Podney]

Some tyre manufacturers have websites that will tell you,try googling them.
The Tyresafe one,already mentioned,is good.
Most tyres have their maximum pressure limit on them. Also check their age,which is usually stamped on the inner wall,being four numbers,the first two is week of production,and the last two are the year of production. Check for cracks and bulges.
Lots of other very good tyre threads on here.

 

[zac]

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

This will help if you know the axle loads.

Just used that site to check mine and for some reason its way off, with the correct axle weights on each of the 3 axles on my tag it comes out at 44 psi on the rear. If i put that in it would be dragging the floor

 

[scotjimland]

As said, the correct size tyres and pressures are on the data plate on the drivers door pillar or user manual.. but only correct if you have a PVC or coach-built on a van chassis that has not been up plated.

On a tag axle or coach built with an Al-Ko chassis they will be different from the original base vehicle data ..

This is the sticker from my Ducato 2.8JTD .. LWB panel van . MAM 3,300 kg

4.i and 4.5 bar ... 59 and 65 psi

 

[Lenny HB]

Best way is to ask the tyre manufacture, I emailed Toyo with the axle weights I run at. They replied within ½ hour with correct pressures.

 

[HKF]

Thank you so much for all the replies so far. One thing that's confusing me is that some say to look at the sticker on the door pillar and some say to go by the figures on the tyres themselves. And then, some say that the figure on the tyre is the maximum and that inflating to that pressure risks a blowout. The door pillar one has always confused me because surely it depends on what tyres you have? Anyway, I'll try to get to the weighbridge again soon and see what my axle weights are. Then I'll come back and let you all know, together with a pic of the sticker on the door pillar, so that I know what they should be

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[Lenny HB]

some say to go by the figures on the tyres themselves. And then, some say that the figure on the tyre is the maximum and that inflating to that pressure risks a blowout

That is a max inflation figure but it only applies to the American market, so you can ignore it.

 

[funflair]

Thank you so much for all the replies so far. One thing that's confusing me is that some say to look at the sticker on the door pillar and some say to go by the figures on the tyres themselves. And then, some say that the figure on the tyre is the maximum and that inflating to that pressure risks a blowout. The door pillar one has always confused me because surely it depends on what tyres you have? Anyway, I'll try to get to the weighbridge again soon and see what my axle weights are. Then I'll come back and let you all know, together with a pic of the sticker on the door pillar, so that I know what they should be

The correct pressure is directly related to the axle load and the tyre load rating, so you should have tyres fitted with the correct load rating or higher, it's not different makes that really make a difference it's the load rating figure, ie 112,116,121 etc, that is why it always comes back to knowing your axle weights

 

[zac]

Forgot to include this but which seems crucial, so they say if CP tyres fitted which is what I selected anyway then to inflate the rear to 80psi which would be a very hard ride.
Mine are normally 70psi all round but it looks as though i could reduce that on the front by a smidge.

 

[Landy Andy]

That is a max inflation figure but it only applies to the American market, so you can ignore it.

I know this is what is said, but can you explain why, or what that means?

Why do Americans need to know this, and no one else does?

 

[Lenny HB]

I know this is what is said, but can you explain why, or what that means?

Why do Americans need to know this, and no one else does?

No a clue, may be something to do with high temperatures in some states like Nevada.

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[PaulW2]

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

This will help if you know the axle loads.

Interesting, thanks. The readings surprised me a little. With my axle loads of 1850 and 2000 it gave me 53 and 80 psi. Then I put in 1850 on each axle and it still gave 53 and 80.

 

[Lenny HB]

Interesting, thanks. The readings surprised me a little. With my axle loads of 1850 and 2000 it gave me 53 and 80 psi. Then I put in 1850 on each axle and it still gave 53 and 80.

If you put in CP tyres it always gives 80 on the rear, if you put your rear axle weight in front axle box you get a sensible pressure.

 

[PaulW2]

If you put in CP tyres it always gives 80 on the rear, if you put your rear axle weight in front axle box you get a sensible pressure.

That was interesting thanks. So 53 front 59 rear then. Rounded to 55 and 60. Big difference!

 

[AlunandFelicie]

If you put in CP tyres it always gives 80 on the rear, if you put your rear axle weight in front axle box you get a sensible pressure.

Doing this my correct? Pressure came to 53psi front ,70 rear ,does this sound okay for a 3850kg ,7.4m A class?

 

[Dolmen]

On my tyres there is no mention that the maximum permitted tyre pressure (69) only applies to the American market, is this a fact or urban myth, interested as door pillar says 79psi all round, although I do run at 60/65

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[dunnah01]

On my tyres there is no mention that the maximum permitted tyre pressure (69) only applies to the American market, is this a fact or urban myth, interested as door pillar says 79psi all round, although I do run at 60/65

My Michelin CP tyres say 69psi somewhere on the sidewall but the manufacturers have said squeeze in 80psi all round. I run somewhere in-between for comfort and 4 years and 30k later I'm still here to tell the tale

 

[Lenny HB]

Doing this my correct? Pressure came to 53psi front ,70 rear ,does this sound okay for a 3850kg ,7.4m A class?

Got my pressures from Toyo, front 56 psi @ 1930kg, rear 69 psi @2300kg.
The gross weight is irellavant it's the axle weight tyre pressure is based on.

 

[AlunandFelicie]

Got my pressures from Toyo, front 56 psi @ 1930kg, rear 69 psi @2300kg.
The gross weight is irellavant it's the axle weight tyre pressure is based on.

Front axle is 1850 rear 2240

 

[Lenny HB]

Front axle is 1850 rear 2240

Those are the max what are the axle weights you run at?
That is what you set the tyre pressures for.

 

[AlunandFelicie]

Those are the max what are the axle weights you run at?
That is what you set the tyre pressures for.

Need to get to a Weighbridge then?but presumably less than the max so 55f 70r should be good? I currently run at 80!!!! All round ,bash ,bang ,clatter oh my spine

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[OttovanKamper]

Okay, so looked at labels and tyres and checked to get differing results.
Tyres are 225/75 16R 116
Label inside door says 5.5 bar
Other door has axle weights of
Axle 1 2000 and axle 2 1850.
If I go 1 = front then pressure in front tyres is 3.7 bar
If 1 = rear then pressure in fronts changes to 4.2bar.
Rears in both cases are 5.5.

The tyres were inflated to 3.7 bar all round by dealer at delivery.
It is a Fiat Ducato 6m PVC from Hymer.

So what is correct?

 

[VXman]

Okay, so looked at labels and tyres and checked to get differing results.
Tyres are 225/75 16R 116
Label inside door says 5.5 bar
Other door has axle weights of
Axle 1 2000 and axle 2 1850.
If I go 1 = front then pressure in front tyres is 3.7 bar
If 1 = rear then pressure in fronts changes to 4.2bar.
Rears in both cases are 5.5.

The tyres were inflated to 3.7 bar all round by dealer at delivery.
It is a Fiat Ducato 6m PVC from Hymer.

So what is correct?

Has one of the stickers got the Hymer label on and the other perhaps the original (pre conversion) Fiat one? 5.5 all round is fairly typical for motorhomes but PVC maybe different.

 

[OttovanKamper]

Think both are the Fiat stickers.
We are away in van at the moment.
Thought I had Hymer info with me but don’t so will check again when home at weekend.

 

[CAB96]

Okay, so looked at labels and tyres and checked to get differing results.
Tyres are 225/75 16R 116
Label inside door says 5.5 bar
Other door has axle weights of
Axle 1 2000 and axle 2 1850.
If I go 1 = front then pressure in front tyres is 3.7 bar
If 1 = rear then pressure in fronts changes to 4.2bar.
Rears in both cases are 5.5.

The tyres were inflated to 3.7 bar all round by dealer at delivery.
It is a Fiat Ducato 6m PVC from Hymer.

So what is correct?

Axle 1 is Front.

 

[Lenny HB]

Other door has axle weights of
Axle 1 2000 and axle 2 1850.
If I go 1 = front then pressure in front tyres is 3.7 bar
If 1 = rear then pressure in fronts changes to 4.2bar.

That's ilrelavant those are max axle weights you set the tyre pressures for the actual weights you run at. So you have to go to a weighbridge fully loaded to measure the axle weights.

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