Checking Motorhome tyre pressure

[Nickorchard]

Hello
We recently bought an Auto-trail EK 590
I wanted to check the tyre pressures which need to be 75 PSI

Took it to local garage and the supermarket garage however the compressor max pressure was 60 PSI

Where do people take Moto homes to check tyre pressures or do I need to get my own compressor?

Cheers

Nick

 

[Peregrinator]

Lifted from Bridgestone site,
Pull over until your tyres cool down – Waiting it out until the tyres cool off is the best thing to do in case of overheating. If you think that letting a little air out of the tyres is a quick solution, you could be driving on tyres that are under inflated, which is just as hazardous.
Keep to the speed limit – The faster you go, the greater the friction, and consequently, the greater the heat. Which in turn increases the chances of a blowout.


Be aware of the load weight – The more you load your vehicle, the greater the weight on the tyres, increasing the likelihood of a blowout.
Have your tyres inflated to the recommended level – The proper amount of air pressure for safe driving varies depending on the car you drive. The vehicle manufacturer recommendation is the one to go for. It should be mentioned on the inside of the driver door and in the owner’s manual.

Note: Do not confuse the “recommended” amount with the “maximum” amount listed on the tyre itself.
Mike.

That's the idea of TyrePal, You know instantly your tyre pressure, so it will never be an hazard.
Correct in what you say:
The faster you go, the greater the friction, and consequently, the greater the heat. Which in turn increases the chances of a blowout, not with TyrePal, pressure monitored at all times so no blowout.
vehicle manufacturer recommendation is 80psi

Motorhome manufacturer recommendation is 80psi

Tyre manufacturer recommendation is 80psi

you can't wrong go there.

Drive safe & always have fun

 

[Peregrinator]

Hmmm….so what psi do you reduce them by for the 20°C difference….presumably 7psi

Always keep them at 80psi

 

[Peregrinator]

Yes but on the tyre it says 113 (which is 2300kg across the axle) at 80psi (Michelin Agilis Camping that is). It doesn’t give a temperature. People say when cold but what’s cold 20°C or 5°C.

Also are we saying that rested tyre pressures go up on their own when the temperature changes. In Lenny HB ’s case he is saying he puts in 70psi when the temperature is 5°C and when he arrives in Spain where the temperature is 30°C his resting tyres are suddenly 75°C so he lets them down. Is that correct ?

I think “when cold” is the confusing thing. It’s not really when cold its 80psi at the rested temperature of the temperature you happen to be in which now I’ve written it is the same thing.

Lenny HB so what axle weight at the rear do you run on. I know I am sounding a bit obsessed but I nearly died this year going over a viaduct when the tyre blew . Their was lots of screaming from er indoors as well….which was more frightening than the tyre blowout.

Your trying too hard to understand something which is very simple, no matter the temp, just keep them at 80psi

 

[kevenh]

Your trying too hard to understand something which is very simple, no matter the temp, just keep them at 80psi

I dunno.
I think you’ve made something simple dangerous.
Putting more pressure into a tyre because it’s very cold means when you start driving and the tyre warms up it will be over pressure and not riding the tarmac optimally.
Use a look up pressure chart of you want to adjust for the ambient air temperature or just adjust tyre pressure when it’s 18deg C
Other times, check the tyre pressures on your vehicle are all about the same. I.e. look for one that’s a few PSI lower than the others. It could be a slow puncture.

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[Peregrinator]

I dunno.
I think you’ve made something simple dangerous.
Putting more pressure into a tyre because it’s very cold means when you start driving and the tyre warms up it will be over pressure and not riding the tarmac optimally.
Use a look up pressure chart of you want to adjust for the ambient air temperature or just adjust tyre pressure when it’s 18deg C
Other times, check the tyre pressures on your vehicle are all about the same. I.e. look for one that’s a few PSI lower than the others. It could be a slow puncture.

Your not understanding, if you have tyre sensors, you know what the tyre pressures are at all times, so always keep them at 80psi, my advice to you, get tyre sensors, it will ease your mind, and will always feel safe.

 

[kevenh]

Your not understanding, if you have tyre sensors, you know what the tyre pressures are at all times, so always keep them at 80psi, my advice to you, get tyre sensors, it will ease your mind, and will always feel safe.

But I have tyre sensors so that’s why I know the PSI rises & falls with temperature changes yy

 

[Lenny HB]

I dunno.
I think you’ve made something simple dangerous.
Putting more pressure into a tyre because it’s very cold means when you start driving and the tyre warms up it will be over pressure and not riding the tarmac optimally.
Use a look up pressure chart of you want to adjust for the ambient air temperature or just adjust tyre pressure when it’s 18deg C
Other times, check the tyre pressures on your vehicle are all about the same. I.e. look for one that’s a few PSI lower than the others. It could be a slow puncture.

You always set tyre pressures cold, any rise in temperature when driving will be relative to the ambient temperature.

 

[kevenh]

You always set tyre pressures cold, any rise in temperature when driving will be relative to the ambient temperature.

Changes in temperature of the tyre will also be related how the tyres deform on the road surface as they turn & flex. This creates resistance and some of this is turned into heat yy

 

[Hugoman]

I dunno.
I think you’ve made something simple dangerous.
Putting more pressure into a tyre because it’s very cold means when you start driving and the tyre warms up it will be over pressure and not riding the tarmac optimally.
Use a look up pressure chart of you want to adjust for the ambient air temperature or just adjust tyre pressure when it’s 18deg C
Other times, check the tyre pressures on your vehicle are all about the same. I.e. look for one that’s a few PSI lower than the others. It could be a slow puncture.

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[Hugoman]

I wasn’t going to put more pressure in when they were cold….the opposite in fact. I put in 80psi when it was very cold 2°C….but then I thought I’m off the next day to between 12°C ( France) and within a week Spain 26°C ! so thought I’d reduce them by the required amount before I left. I’ve now decided to go with 76psi rear and 66psi front having been to a weigh station. I’ll check them on the way anyway I suppose. Never used to worry until I had a blowout .

 

[Lenny HB]

I wasn’t going to put more pressure in when they were cold….the opposite in fact. I put in 80psi when it was very cold 2°C….but then I thought I’m off the next day to between 12°C ( France) and within a week Spain 26°C ! so thought I’d reduce them by the required amount before I left. I’ve now decided to go with 76psi rear and 66psi front having been to a weigh station. I’ll check them on the way anyway I suppose. Never used to worry until I had a blowout .

I usually adjust them when I get to Spain, didn't bother last April we had to come bake to France for some warm weather.
I don't bother if the difference is less than 5 psi, might be more worried if I was running CP's at their 80 psi max.

 

[Hugoman]

might be more worried if I was running CP's at their 80 psi max.

Which I am….that’s why I’ve reduced them to 76 at the rear….I notice the new Michelin Cross Climate ones get to 113 …..2300kg across axle at 65psi….got to wait till these ones wear out first …..or explode.

 

[BouncyBoatFolk]

Which I am….that’s why I’ve reduced them to 76 at the rear….I notice the new Michelin Cross Climate ones get to 113 …..2300kg across axle at 65psi….got to wait till these ones wear out first …..or explode.

I've only had one tyre blow out, which was a front on a Bedford TK, with no power steering, scary, but manageable.
Cruise onto hard shoulder, and await HGV recovery/breakdown.
Mike.

 

[Hugoman]

I've only had one tyre blow out, which was a front on a Bedford TK, with no power steering, scary, but manageable.
Cruise onto hard shoulder, and await HGV recovery/breakdown.
Mike.

Yep…did exactly that. Girlfriend looks all smiley there but 30 minutes before she was screaming that we were all going to die . Think she fancied the Spanish plod who turned up .

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[Peregrinator]

But I have tyre sensors so that’s why I know the PSI rises & falls with temperature changes

Same here

 

[Peregrinator]

Yep…did exactly that. Girlfriend looks all smiley there but 30 minutes before she was screaming that we were all going to die . Think she fancied the Spanish plod who turned up . View attachment 724428View attachment 724429View attachment 724430

Just a word of warning, that tyre has gone past the sale by date, 11 years is old for tyres, I would check all your tyres if I was you, and if they are the same age, replace them, do you really want to risk it

 

[Hugoman]

Just a word of warning, that tyre has gone past the sale by date, 11 years is old for tyres, I would check all your tyres if I was you, and if they are the same age, replace them, do you really want to risk it

Yes it was the spare tyre (because I’d driven over a nail and put the spare on) which had been in the internal garage of the MH, not exposed to sun or cold , and still had the yellow chalk marks on. It was in effect new. My others are one year old Michelin Agilis.

 

[Peregrinator]

Yes it was the spare tyre (because I’d driven over a nail and put the spare on) which had been in the internal garage of the MH, not exposed to sun or cold , and still had the yellow chalk marks on. It was in effect new. My others are one year old Michelin Agilis.

That's good then, Wouldn't matter how tyres are stored, if it has rubber in them, they will rot over time.

 

[Hugoman]

Still don’t really know what pressure to put in. On the tyre it says 113 at 80psi (which is 2300kg across the axle)….I looked it up. If I was running at 2300kg on the rear axle I would put in 80psi when cold. Surely when I start driving the pressure would go over 80psi because of friction and the tyre is max psi of 80.

I don’t run at 2300kg I run at 2180. Each 4psi equates to 100kg across axle so presumably I should put in 76psi or even 75psi which would give me a bit of leeway for
friction heat and ambient temperature.

I’m in France now, soon Spain…not sure where I could get Trye Pals from.

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[Lenny HB]

Still don’t really know what pressure to put in. On the tyre it says 113 at 80psi (which is 2300kg across the axle)….I looked it up. If I was running at 2300kg on the rear axle I would put in 80psi when cold. Surely when I start driving the pressure would go over 80psi because of friction and the tyre is max psi of 80.

The max 80psi on the tyre is only applicable for the American Market.
Also as I keep telling you set the tyre pressure cold tyre manufacturers are not stupid they do know the pressure increases when you drive and the tyre gets hot.
It's the tyre manufacturers that tell you to set the pressure when cold.

 

[Hugoman]

The max 80psi on the tyre is only applicable for the American Market.
Also as I keep telling you set the tyre pressure cold tyre manufacturers are not stupid they do know the pressure increases when you drive and the tyre gets hot.
It's the tyre manufacturers that tell you to set the pressure when cold.

So why are others saying don’t look at the recommendations on the trye look at the manufacturers recommendation on the vehicle ….on the inside of the door (some chance on a Hymer). What IS the recommendations of Hymer or Fiat Ducato or even ALKO….no idea. Can only go by trye side wall . 113 at 80psi.

 

[Lenny HB]

So why are others saying don’t look at the recommendations on the trye look at the manufacturers recommendation on the vehicle ….on the inside of the door (some chance on a Hymer). What IS the recommendations of Hymer or Fiat Ducato or even ALKO….no idea. Can only go by trye side wall . 113 at 80psi.

I just told you the pressure on the tyre is only for the American Market.

I give up I'm out.

 

[Hugoman]

I just told you the pressure on the tyre is only for the American Market.

I give up I'm out.

HaHa…no patience ….STILL no one has told me what pressure to put in a trye when running at 2180kg on rear axle….is it because no one really knows !

 

[Hugoman]

What I’d really like to do would be to run at 2080kg on rear axle but to do that I would either have to ditch the scooter or ditch the Mrs……and she’s not too keen on being ditched.

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[Hugoman]

And also on the Continentals it is 65psi for 113. And yes I have contacted them and that is just for the American market but not so sure about the Michelins unless Lenny HB (when he’s come back from his lie down) is saying the Michelins would be OK at 90psi or something !

 

[BouncyBoatFolk]

Mid 70s psi would put you within a 10% calculation of recommended pressure on the door pillar, giving a plausible defence if a very officious plod happened to check your tyre pressure. Even just that small amount helps to smooth out the road surface. Try it for a day or two, if you're unhappy with it go back to 80psi.
Mike.

 

[Reallyretired]

If the tyre manufacturers say 80psi cold, which they do, then any subsequent rise due to the tyre warming up has been taken into account by them. Michelin are probably aware that tyres warm up in use. They've only been making them for over 100 years.

 

[BouncyBoatFolk]

And also on the Continentals it is 65psi for 113. And yes I have contacted them and that is just for the American market but not so sure about the Michelins unless Lenny HB (when he’s come back from his lie down) is saying the Michelins would be OK at 90psi or something !

They probably will be fine at 90psi, the manufacturers will have calculated that tyres will increase in temperature when being used [ Death Valley 125+ deg]. But they will drop back to the pressure you set them at when left unused for a while.
Mike.

 

[dunnah01]

And also on the Continentals it is 65psi for 113. And yes I have contacted them and that is just for the American market but not so sure about the Michelins unless Lenny HB (when he’s come back from his lie down) is saying the Michelins would be OK at 90psi or something !

Agilis CP will always be 80psi set before you go anywhere and when you have to put a coat on to check the pressure. If you beg Michelin will allow 65psi on the front axle tyres.
My TPMS shows around 90psi once up to temp on the motorway

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[kevenh]

If you beg Michelin will allow 65psi on the front axle tyres.
My TPMS shows around 90psi once up to temp on the motorway

Maybe related. A soft tyre will warm up quickly due to the extra movement generating heat.