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Old 04-22-2016, 04:06 PM   #1
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Yay, Another Tire Pressure Question

I have some conflicting information on my tire pressure for my 1999 Fleetwood Bounder. The tires are Sumitomo ST718 LT 245/70R 19.5. The placard inside the coach gives tire pressure on 80 PSI for these size tires but the sidewalls on the tires say 110 PSI min. pressure. All of the tires currently read 85 psi, I suspect from the previous owner that had the tires installed new before we bought the rig. We haven't weighed anything yet, but we are pretty loaded. So which should I be using for tire pressure? Chuck
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Old 04-22-2016, 04:29 PM   #2
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You will never know for certain until you get a four corner weight. In lieu of that axle weights at any CAT scale, other commercial scale or even some weigh stations may get you in the ball park.

If it me and I was pretty weighted I would go to 5 p.s.i.g. below max.
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Old 04-22-2016, 04:32 PM   #3
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The tire pressure on the sidewall is the required COLD pressure at the max weight rating of the tires, never use it and never exceed it. The pressure on the placard is the required COLD pressure for the chassis -- one should never exceed the chassis weight. However, the placard also tells you what the tire requirement is for that weight, so if you use that tire, use that weight and be safe. TO be exact, use a tire at least as strong as the tire specified on the placard, and use the pressure that the tire manufacturer specifies for your actual rv weight. NEVER use the sidewall pressure, just never exceed this pressure or the weight that goes along with it.
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Old 04-22-2016, 04:46 PM   #4
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I have a 1999 34V F53 Bounder. Steer Axle Wt. 5320 lbs, Drive axle Wt. 11620 lbs
Total 16940. I was unable to weigh ea corner. Placard says 80 lbs steer and drive axles. I run 85 Pounds and may up to 90 lbs this summer.
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Old 04-22-2016, 04:56 PM   #5
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Try to find a Sumotoma tire chart for your tires. Use the axle weights from the placard and look on the chart. It will tell you what you need to know. If they are the same size and load rated tires as what the placard has then I'll bet they have similar psi numbers.
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Old 04-22-2016, 08:40 PM   #6
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Somitomo chart gives the PSI based on weight, starting at about 80 PSI and going up to 120 psi. It may be a while before I can get the rig weighed because the closest scales are a long way from me. That's why I ask the original question as to which is more accurate and which I should use until then, the placard or the sidewalls. Chuck
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