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Old 10-14-2020, 07:31 PM   #1
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Tire pressures after weighing

Wondering if its worth it to lower pressures based on the weights of the axles? 2020 Ventana 4369. The dealer set the pressures to 120psi front - 90psi drive - 90psi tag. After weighing it with a full fuel tank , 1/2 water tank and all belongings it was just under 39k. The manuals say I can lower the fronts 110psi, the drive to 75 psi and the tag to 75 psi. I still have 5k of payload left and am not hauling anything yet. Is it worth lowering them? Iím weighing tire wear vs ride. I donít think it rides bad now but I have nothing to compare it to. Thoughts?
Thanks Jason
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Old 10-14-2020, 07:41 PM   #2
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Here is how I see it.....you'll never wear out the tires before they rot out. I want a soft ride with decent handling and mileage. My rears are similar to yours in terms of tire pressures, but since you don't feel a lot of the ride from the rears, I would run them at 85psi. 75psi is too low, you won't feel the extra 10psi as much as you would in the front.

On the fronts, I would run them at 110psi, per the weight chart to soften the front end. If you're uncomfortable with that, run them to 115psi, but 120 psi is way too much.
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Old 10-14-2020, 08:53 PM   #3
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Michelin doesn't recommend under 85 if I remember correctly. That's what I have in the drive and tag.
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Old 10-14-2020, 08:59 PM   #4
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I had an Ď05 Dutch Star 4320 and kept the fronts at 110 and 90 on the drive an tag. I keep the same pressures on my London Aire 4519.
I hope this helps you.
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Old 10-15-2020, 06:02 AM   #5
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That helps a lot guys thanks! I will stick to the 85-90 in the rear and lower the fronts a bit.
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Old 10-15-2020, 11:46 AM   #6
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Quote:
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Michelin doesn't recommend under 85 if I remember correctly. That's what I have in the drive and tag.
Interesting since the Michelin guide goes down to 70lbs. I go with 5 lbs more pressure than the chart calls for.
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Old 10-17-2020, 09:33 AM   #7
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100 psi front cold and 80 psi rear cold here. They will pick up plenty of pressure as the day goes on.
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Old 10-18-2020, 12:49 AM   #8
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Tire pressures after weighing

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Originally Posted by OverDo View Post
100 psi front cold and 80 psi rear cold here. They will pick up plenty of pressure as the day goes on.
Wrong. Procedure is to set the target pressure when cold, and let the tires run. Pressure change due to road heat is already baked into the cake. If your recommended pressure is 110/90, you are running about 10% low, which is borderline.
Donít argue it here. Check with Roger Marble, goes by ďTireman9Ē. Been designing tires for 40 years.
Good luck.
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Old 10-21-2020, 12:46 PM   #9
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Cold Tire Pressure in different temperatures

I read an article about "cold" tire pressure and it says the tire pressure charts are based on "cold" being 70 degrees and that pressure changes by 2 PSI per 10 degrees.

So, if the Michelin chart indicates the pressure for your tire (based on the weight) is 100 PSI, then you would adjust that target PSI by 2 PSI for every 10 degree variation from 70 degrees.

What do you think about this? In our 4.5 years of Full-Timing, I have been using the same tire pressure regardless of the outside temperature. As full timers, we try to not get into any real cold areas, so our highs and lows are not that different.

https://www.technorv.com/articles/am...tire-pressure/
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Old 10-21-2020, 12:56 PM   #10
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Set/adjust when COLD....not driven on for at least 2 hrs

Best time is in AM on travel day prior to departure

Then check/adjust on NEXT travel day
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Old 10-21-2020, 01:16 PM   #11
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Old Biscuit has it right its explained in this thread from the big sticky.
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Old 10-21-2020, 01:51 PM   #12
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Definition of cold tire

I agree that pressure should be set when tires are "cold" (not driven for at least 2 hours and not in direct sun). However, if the "cold" conditions are met, and you are in South Dakota and it's 30 degrees outside, would the same pressure be used there as opposed to being in Florida and the ambient temperature is 80 degrees?
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Old 10-22-2020, 09:52 AM   #13
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Originally Posted by woodosgood View Post
I agree that pressure should be set when tires are "cold" (not driven for at least 2 hours and not in direct sun). However, if the "cold" conditions are met, and you are in South Dakota and it's 30 degrees outside, would the same pressure be used there as opposed to being in Florida and the ambient temperature is 80 degrees?


I live in Michigan and leave for Florida in January. I usually have to add air to tires when leaving due to cold weather. When I arrive in Florida and check the cold tire pressure in the morning I usually have to bleed off about 6 psi to reach the correct cold psi.
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