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Old 11-03-2014, 10:22 AM   #15
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Look, this isn't complicated at all. If you know the weight carried by each axle or tire, you can optimize the tire pressure using the tire manufacturer's pressure table. If you don't, you have to use the RV manufacturers recommended pressure on the data plate. That recommendation is also based on not knowing the actual weight, so it's enough to carry a fully loaded axle. It's not optimum, but it's safe. Unless you have actually overloaded the axle, in which case you have other problems anyway.

You don't need to worry about whose psi values to use or what table entry is best unless and until you have actual weights. Nor do you need to worry about the psi on the side of the tire. It's not a recommendation - it's just there in conjunction with the max load spec for the tire.
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Old 11-03-2014, 10:47 AM   #16
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Quote:
Originally Posted by Gary RVRoamer View Post
Look, this isn't complicated at all. If you know the weight carried by each axle or tire, you can optimize the tire pressure using the tire manufacturer's pressure table. If you don't, you have to use the RV manufacturers recommended pressure on the data plate. That recommendation is also based on not knowing the actual weight, so it's enough to carry a fully loaded axle. It's not optimum, but it's safe. Unless you have actually overloaded the axle, in which case you have other problems anyway.

You don't need to worry about whose psi values to use or what table entry is best unless and until you have actual weights. Nor do you need to worry about the psi on the side of the tire. It's not a recommendation - it's just there in conjunction with the max load spec for the tire.


I agree. Actual weights and tire makers chart, no need to create pretty spreadsheets for information already available. Who has a tire gauge that ACCURATELY reads to the closest PSI? Tire pressure changes with outside temperature, radiant heat of sun, barometric pressure, etc. No need to obsess to the closest PSI, if in doubt, add 5 PSI to tire makers number.
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Old 11-04-2014, 07:51 AM   #17
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Then I try to make clear why not to use the pressure/loadcapacity lists of the tire-makers, and give arguments why to add a reserve.
And give a picture of my filled in spreadsheet in wich used axle load and reserve is given .
And still my arguments are wiped away by writing that there is no need for spreadsheets if there are load-charts.

Spend many hours on making the spreadsheet and gathered a lot of information in time, so think I know exact how the systems work .

And Yes I am an amature, not working in the tire- or car- business.
But American TRA did not step over for no reason, as late as 2005( after Ford Firestone affaire ) tho the calculation for loadcapacity for a pressure that European ETRTO was using since 1970 for all kind of tires.
Still wonder why at the same time they did not also do that for LT and Truck tires , only did it for P tires and XL//, and left LT and Trucktires to the old calculation.
This old calculation for LT and Truck was only slighty better then that old for P-tires and XL but still not good enaugh. Even the ETRTO calculation for all kind of tires , is not good enaug for LT and trucktires, acording to an American IR J.C.Daws.
And Michelin , an European brand, calculates the same tire different for the american market then the European.
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