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Old 02-23-2016, 11:13 AM   #1
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I just purchased a 1988 Pace Arrow. The vehicle stamp says to use 8 x 19.5 tires and that is what is on it. The tires are like new so I purchased tire covers.

On the stamp it says 70 psi cold on all tires. The previous owner told me 110 in the front, 100 in duals. Should I go by the stamp?

By the way GVWR is 14,660, GAWR Front 5,200

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Old 02-23-2016, 12:15 PM   #2
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Welcome to iRV2.

Given the age of the RV , I doubt that the tires are original equipment. So going by the tag in the RV would be questionable. You need to look at the tire sidewall for " Max inflation cold " info.
Also there should be a 4 number code on the side wall to tell you when the tires were manufactured ( I'll see if I can track down a photo ) the first two numbers indicate the week and the last two the year.
E.G. 3505 will mean 35th week of 2005
If the tires are more than 7 years old , NO MATTER HOW GOOD THEY LOOK , they are due to be replaced before a trip.
Weighing the RV and getting a proper inflation chart from the tire manufacturer are in order.

EDIT>Pictures and links to info in this post.

Goodyear G159 tires

99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
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Old 02-24-2016, 02:21 PM   #3
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Thanks for the tire info, I will check numbers.
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Old 02-24-2016, 02:33 PM   #4
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The pressure on the sidewall of a Michelin RV tire and many others is not the "Maximum" the tire should ever have (unlike car tires) it is the minimum to support the maximum rated carrying capacity of the tire.

From the Michelin RV Tire Guide:
"If you look at the tire's sidewall, you'll see the maximum load capacity allowed for the size tire and load rating, and the minimum cold air inflation needed to carry the maximum load."
From page 6 of the GoodYear RV Tire and Care Guide:
"How much air is enough?
The proper air inflation for your tires depends on how much your fully loaded RV or trailer weighs. Look at the sidewall of your RV tire and you’ll see the maximum load capacity for the tire size and load rating, as well as the minimum cold air inflation, needed to carry that maximum load."
From TOYO:
Q: What are the consequences of inflating the tires to accommodate the actual loads?
A: If the inflation pressure corresponds to the actual tire load according to the tire manufacturer’s load and pressure table, the tire will be running at 100% of its rated load at that pressure. This practice may not provide sufficient safety margin. Any air pressure loss below the minimum required to carry the load can result in eventual tire failure.
But then they go ahead and publish a weight/pressure chart allowing lower pressure for RV's!!

From the August 2010 Motorhome Magazine "Tread Carefully" tire article:
The maximum load capacity allowed for the size tire and load rating and the minimum cold air inflation needed to carry that maximum load are located on the tire’s sidewall.
From our owners manual:
Federal law requires that the tire’s maximum load rating be molded into the sidewall of the tire.
If you look there, you will see the maximum load allowed and the cold air inflation pressure required to carry that stated maximum load. Less air pressure restricts the tire to carry a lighter load.
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Old 02-24-2016, 05:36 PM   #5
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The way I work regular tires is fill to max pressure, watch the wear, if in the center, then I will reduce the pressure. I will keep in mind the body stamp and what the sidewall says on the tire. I have a lot of work to do on this motorhome, trips will be short, time will tell.
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