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Old 12-20-2017, 05:39 PM   #1
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Another Tire Question

I recently received a tire chart from the president/COO of Armstrong Tires. (The tires on my class A motor home)
Attached is scale receipts for our motor home with and without the utility trailer.



Presuming the best advise is to use the heaviest option then I must presume a combination of the two scales.

(the front axle is heaver without the trailer attached and of course the real axle is heaver with the trailer attached.

So, using the front axle of 5300 pounds and the rear axle of 9400 pounds, here is my question



Front axle of 5300 pounds divided by two tires. Then each tire is carrying 2650 pounds. Using your tire chart, then I should have each front tire at 65 PSI (which will carry 3085 each) SINGLE



Rear axle of 9400 pounds divided by 4 tires. Then each tire is carrying 2350 pounds. Using your tire tire chart, then I should have each rear tire at 65 PSI (which will carry 2910 each) DUEL



Although, the president/COO agreed with my math and logic, these just seems low tire pressure. Using 65 PSI all the way around would be easy to remember.
What are your thoughts?
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Old 12-20-2017, 07:34 PM   #2
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your inflation table is very difficult to read. tell us the model tire and size.
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Old 12-20-2017, 08:57 PM   #3
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Sorry, (If you click on the image, it will bring it up in it's own window)

245/70R/19.5
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Old 12-20-2017, 09:19 PM   #4
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assuming your weights were done when your MH was loaded for travel...fresh water,fuel, LP, food, supplies, clothing, pets and people; and assuming you have used the correct inflation table (be sure you have the correct table for the model of tire and not just the size) then i agree with your conclusions. keep on mind the correct inflation is the minimum needed for the load being carried. you can run higher pressures up to the maximum psi but the higher the pressure the rougher the ride. personally, i add 5-psi to our tires just cuz.
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Old 12-20-2017, 11:10 PM   #5
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Like rk said, assuming you were completely loaded like you are when headed out on the road then your observed weights are what you should base your tire pressures on. I too would add an additional 5psi in all 6 tires just to give you a little extra wiggle room from the tire inflation charts recommended minimum.

I don't see any reason why you couldn't run all 6 tires at 70PSI. Should still have a very comfortable ride.

Your 19.5" tire is pretty robust for a 16000 GVWR vehicle. You are sort of on the lower end of that tires weight carrying capacity. This is a good thing.
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