Tire Pressure Again
I know this has been discussed before. I could probably figure it out from searching the forum but I am in a rush to prepare for my first camping trip. I am also in a rush since I am going into the tr...
Forum Discussion
@ jerseyjim
In Europe , where I live, the chassis maker of motorhome often give advice pressure wich is based on GAWR's, and Motorhome maker removes this and gives 80 psi all around as advice. This is because European motorhomes mostly are overloaded , because normal driverslicence B only allows GVWR of 3500kg/7700lbs, and max 8 passengers( with driver makes 9 persons max in car.
This makes empty weight of often for newer motorhomes of 3000 kg/6600 lbs and so with all the luggage and fuels and persons in it it goes over 3500kg.
This is not allowed , but happens. Motorhome-makers know this, and by that give that high advice of 80 psi, but this is only needed on rear axle, front often does not come to GAWR even when 500kg/1100lbs overloaded .
This gives bumping and discomfort but also loss of gripp on difficult underground. Many Eur motorhomes are front wheel drive.
Thats the reason why you have to make it complicated as you write, because motorhome makers advice is not always the best.
To be complete, the gross of European motorhome tires are 8PR/D-load with AT-pressure of 65 or 70 psi , and so 80 psi advice is 10 psi above that , wich is even allowed by American LT tire-makers.
Gives often confusion because on sidewal that "maximum load xxxx lbs AT yyy psi ( cold) is given, sometimes even called maxpress, wich indicates its the maximum allowed cold pressure but is not.
But there are more reasons, wich also count in USA, and that is because pressure advice is based on GAWR with no reserve, and in USA because of larger motorhomes, real axle weights are often below GAWR, even behind, and you can do with lower pressure , dispite of the build in reserve, then Motorhome maker gives, wich gives more comfort and gripp , and still save for the tires.
In Europe , where I live, the chassis maker of motorhome often give advice pressure wich is based on GAWR's, and Motorhome maker removes this and gives 80 psi all around as advice. This is because European motorhomes mostly are overloaded , because normal driverslicence B only allows GVWR of 3500kg/7700lbs, and max 8 passengers( with driver makes 9 persons max in car.
This makes empty weight of often for newer motorhomes of 3000 kg/6600 lbs and so with all the luggage and fuels and persons in it it goes over 3500kg.
This is not allowed , but happens. Motorhome-makers know this, and by that give that high advice of 80 psi, but this is only needed on rear axle, front often does not come to GAWR even when 500kg/1100lbs overloaded .
This gives bumping and discomfort but also loss of gripp on difficult underground. Many Eur motorhomes are front wheel drive.
Thats the reason why you have to make it complicated as you write, because motorhome makers advice is not always the best.
To be complete, the gross of European motorhome tires are 8PR/D-load with AT-pressure of 65 or 70 psi , and so 80 psi advice is 10 psi above that , wich is even allowed by American LT tire-makers.
Gives often confusion because on sidewal that "maximum load xxxx lbs AT yyy psi ( cold) is given, sometimes even called maxpress, wich indicates its the maximum allowed cold pressure but is not.
But there are more reasons, wich also count in USA, and that is because pressure advice is based on GAWR with no reserve, and in USA because of larger motorhomes, real axle weights are often below GAWR, even behind, and you can do with lower pressure , dispite of the build in reserve, then Motorhome maker gives, wich gives more comfort and gripp , and still save for the tires.
