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10-14-2020, 07:31 PM
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#1
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Junior Member
Join Date: Aug 2020
Posts: 18
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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? I’m weighing tire wear vs ride. I don’t think it rides bad now but I have nothing to compare it to. Thoughts?
Thanks Jason
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10-14-2020, 07:41 PM
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#2
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"Formerly Diplomat Don"
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 24,122
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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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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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10-14-2020, 08:53 PM
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#3
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Senior Member
Newmar Owners Club Spartan Chassis
Join Date: Oct 2014
Location: Lake McClure, CA
Posts: 1,449
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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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2018 Dutch Star 4369 Spartan Chassis
2016 Jeep Cherokee, 1952 Willys CJ3A
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10-14-2020, 08:59 PM
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#4
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Community Moderator
Newmar Owners Club
Join Date: Feb 2011
Location: Point Pleasant Beach, NJ
Posts: 31,553
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I had an ‘05 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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Tony & Ruth........... FMCA#F416727
2016 London Aire 4519, Freightliner chassis, Cummins ISX, 2018 Jeep Wrangler Unlimited, Blue Ox Avail with AF1. TST 507 TPMS
No amount of money can buy you an extra second of time.
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10-15-2020, 06:02 AM
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#5
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Junior Member
Join Date: Aug 2020
Posts: 18
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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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10-15-2020, 11:46 AM
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#6
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Senior Member
Spartan Chassis
Join Date: Mar 2017
Posts: 1,545
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Quote:
Originally Posted by 10 fan
Michelin doesn't recommend under 85 if I remember correctly. That's what I have in the drive and tag.
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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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10-17-2020, 09:33 AM
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#7
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Senior Member
Join Date: Jul 2016
Posts: 263
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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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Vern, Paula and Kip the psycho billy devil dog
2017 Dutch Star 4369 2014 CR-V Toad (sold)
2017 Newmar Ventana 3412 (sold)
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10-18-2020, 12:49 AM
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#8
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Senior Member
Newmar Owners Club Freightliner Owners Club
Join Date: May 2012
Location: Today? Clayton, North Carolina
Posts: 5,093
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Tire pressures after weighing
Quote:
Originally Posted by OverDo
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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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.
Don’t argue it here. Check with Roger Marble, goes by “Tireman9”. Been designing tires for 40 years.
Good luck.
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John and Diane (RIP Lincoln, 21 FEB 22) RVM103 NHSO
Fulltimers since June, 2012
2002 Dutch Star 40, Freightliner, Cat 3126, 2004 Element
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10-21-2020, 12:46 PM
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#9
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Senior Member
Join Date: Aug 2015
Location: Depends on the weather
Posts: 712
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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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Eric and Linda
2016 Newmar Ventana 4369 (Full Timers since May 2016)
2022 GMC Canyon & 2015 Co-Motion Equator Tandem
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10-21-2020, 12:56 PM
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#10
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Senior Member
Join Date: Nov 2015
Posts: 26,843
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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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I took my Medication today. HAVE YOU?
Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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10-21-2020, 01:16 PM
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#11
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Moderator Emeritus
Nor'easters Club Workhorse Chassis Owner iRV2 No Limits Club
Join Date: Oct 2004
Posts: 30,785
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Old Biscuit has it right its explained in this thread from the big sticky.
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10-21-2020, 01:51 PM
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#12
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Senior Member
Join Date: Aug 2015
Location: Depends on the weather
Posts: 712
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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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Eric and Linda
2016 Newmar Ventana 4369 (Full Timers since May 2016)
2022 GMC Canyon & 2015 Co-Motion Equator Tandem
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10-22-2020, 09:52 AM
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#13
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Senior Member
Join Date: Aug 2013
Location: Canton, MI
Posts: 1,004
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Quote:
Originally Posted by woodosgood
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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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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Tigerfan1
2016 DSDP 4369, Freightliner Chassis, AF One brake system, 2016 Chevy Equinox
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