Tyre pressure quandary?

[Blue di + jean]

We have burstner t686 3.o ltre on a renault master chassis. According to the burstner manual it states: use 225/65 R 16 C (112/110) Q tyres and tyre pressures are front: 4.5 BAR (65 PSI) - rear: 5.5 bar (79 PSI) .We had to go to NTS to get our tyres checked and was informed that our tyres had it stated on their sidewalls the safety pressure was not too exceed 69 psi ??? Does anyone have a clue -if Burstner are stating what tyre and giving a running pressure of 79 psi and the tyre they state has on sidewall not too exceed safety pressure of 69 psi ? What should I run at? .normally I would run at 79 psi as manual states but from insurance view if I have an accident ( running at 20 psi over the back I wonder where I would stand?. Any info gratefully appreciated george

 

[DBK]

Go by what's written on the tyre wall. I'm assuming you don't have tyres fitted which match the specification described in the handbook. If you do, then the handbook would be a good guide but only of course if the recommended pressure isn't higher than whatever is written on the tyre.

There are numerous threads on here about tyre pressures. Ideally, you need to go to a weighbridge and find the weight on each axle and then check what the pressure should be using something like this: https://www.tyresafe.org/check-your-pressures/motorhomes/

 

[Stealaway]

Are the tyres the original ones or have they been replaced?

 

[Blue di + jean]

They were replaced for us buying van 4 new tyres fitted. I have checked sizes and they're exactly what is stated in Burstner manual?

 

[Camdoon]

I quote from Continental having written to them about my tyre pressures "The 69 psi written on the side of the tyre is for the Northern American market only and the inflation pressure of the tyre can exceed this value within its safety operating range." Mine are "ContiVanco Camper 225/65 R16 (CP*) 112 R tyres"
My figures are 47.1 and 76.1 but recommendations go up to 79.8 psi

 

[Blue di + jean]

Just checked make and they are " effitrac three a" and compete size is 225/65 R16 C (112/110) Q don't have a clue as to make never heard of it before? But taking on board your part about 65 psi for no there territories thanks george

 

[androidGB]

THe only thing I can add is that camper tyres are designed to be fully loaded all of the time, unlike commercial van tyres, and Michelin

state their camper tyres run at 80psi irrespective of axle loading

Andrew

 

[pappajohn]

The ' do not exceed 69psi' marking is for the American market only.
Just ignore it.

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[Stealaway]

My original Burstner Continental camper tyres had a section on the side walls saying something like 'Motorhome vehicles can increase their pressure to 5.5 bar' Unfortunately I have just changed them for a new set of Michelin camper tyres but I'm pretty sure they have set the pressures as per the Burstner/Fiat label on the passenger door pillar which are pretty high.

 

[Hettie's Crew]

We have burstner t686 3.o ltre on a renault master chassis. According to the burstner manual it states: use 225/65 R 16 C (112/110) Q tyres and tyre pressures are front: 4.5 BAR (65 PSI) - rear: 5.5 bar (79 PSI) .We had to go to NTS to get our tyres checked and was informed that our tyres had it stated on their sidewalls the safety pressure was not too exceed 69 psi ??? Does anyone have a clue -if Burstner are stating what tyre and giving a running pressure of 79 psi and the tyre they state has on sidewall not too exceed safety pressure of 69 psi ? What should I run at? .normally I would run at 79 psi as manual states but from insurance view if I have an accident ( running at 20 psi over the back I wonder where I would stand?. Any info gratefully appreciated george

Take no notice of any of that twoddle. Get weighed, know your front and rear weights and follow Continentals Technical Data Handbook.

 

[2657]

I tend to think that tyre manufacturers know more about tyres than van manufacturers and converters, I follow what the tyre manufacturer recommends on the sidewall for the maximum load.

Just a question, why would a tyre produced to EU specification have recommended pressures only applicable to the USA?

 

[Larby]

The pressure question was raised last year. I posted this picture. Hope it helps.

 

[jockaneezer]

I run the rear tyres on my T680 at 65 psi, running at a higher pressure makes for a harsher ride. I run on Toyo H09 winter tyres all year round.

 

[Blue di + jean]

I'm beginning to understand the word ""Minefield"" I think I'll bite the said bullet and go for two new rear tyres that state on the sidewall '5.5 bar' thanks one and all for all inputs. And we thought it was less stress campervaning than owning a house . DUHHHH! cheers all george

 

[joka250]

I tend to think that tyre manufacturers know more about tyres than van manufacturers and converters, I follow what the tyre manufacturer recommends on the sidewall for the maximum load.

Just a question, why would a tyre produced to EU specification have recommended pressures only applicable to the USA?

Tyre manufacturers do, as you rightly say, know more about tyres than vehicle manufacturers but I suspect many tyre fitters know less than they should.
Reason for USA pressures is tyre manufacturing is a global business and like most regulated products they try to cover all avenues, "it keeps the costs down!!!!?".

 

[Hettie's Crew]

Try reading this from the tyre manufacturer Continental. This is why I prefer Continental tyres as you get the information you need.
I recently considered Michelin but on enquiry about correct tyre pressure, they always say 65psi front 80psi rear, regardless of the size or weight of your vehicle or tyres, which is ridiculous.
Think I'll be choosing Vancontact 4season next.

http://blobs.continental-tires.com/...998ef8b3/download-technical-databook-data.pdf

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[JeanLuc]

If you intend to run the tyres above 65 psi / 4.5 bar then make sure they are fitted with appropriate high pressure metal stemmed valves. The standard rubber stemmed Schrader - type valve is rated for pressures up to 65 psi only.

 

[Stealaway]

The pressure question was raised last year. I posted this picture. Hope it helps.

That's the one

 

[Stealaway]

I recently considered Michelin but on enquiry about correct tyre pressure, they always say 65psi front 80psi rear, regardless of the size or weight of your vehicle or tyres, which is ridiculous.

Why?

 

[Hettie's Crew]

Why?

Because they are cheaper at £109 fitted at Quickfit online and I need 5.

 

[Stealaway]

Because they are cheaper at £109 fitted at Quickfit online and I need 5.

I was wondering more about the pressures ----- and I've just £110 each fitted for Michelin Camper tyres from Costco

 

[Hettie's Crew]

I was wondering more about the pressures ----- and I've just £110 each fitted for Michelin Camper tyres from Costco

You'd have to ask Michelin that but they apear far from helpful with individual enquiries.

 

[Emmit]

I might be wrong on this but every car I've ever had gives different tyre pressures dependent upon the load ie 2 pax 36psi 5pax 42psi.
Why should it be any different for motorhomes? Not all motorhomes are over laden??? but it's as if Michelin think we're all at the limit of our load.