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01-19-2022, 01:03 PM
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#1
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Senior Member
Entegra Owners Club
Join Date: Oct 2010
Location: Lincoln, NE
Posts: 1,203
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Tire pressure difference
How much of a difference is there in setting tire pressure while still on the jacks versus off the jacks?
Later...
Ray
__________________
Ray & Wendy
Full-time
2014 Anthem 42RBQ - 2018 Jeep Wrangler - FMCA F521969
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01-19-2022, 02:09 PM
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#2
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 13,138
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None.
__________________
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Criticism is easier than Craftsmanship
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01-19-2022, 02:27 PM
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#3
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Senior Member
Entegra Owners Club Spartan Chassis
Join Date: Feb 2010
Posts: 4,236
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Quote:
Originally Posted by Arch Hoagland
None.
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Awesome! Exactly correct.
The volume of the tire doesn't change just because you raise the jacks.
Take care,
Stu
__________________
"I would rather have questions that can't be answered than answers that can't be questioned."
2018 Anthem 42DEQ
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01-19-2022, 02:30 PM
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#4
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Senior Member
Entegra Owners Club
Join Date: Oct 2010
Location: Lincoln, NE
Posts: 1,203
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Cool, I was thinking the added weight on them would increase the pressure.
Later...
Ray
__________________
Ray & Wendy
Full-time
2014 Anthem 42RBQ - 2018 Jeep Wrangler - FMCA F521969
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01-19-2022, 03:00 PM
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#5
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Senior Member
Newmar Owners Club Tiffin Owners Club Entegra Owners Club
Join Date: Feb 2017
Location: Fulltiming Since 2011
Posts: 1,493
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Hi - Absolutely right. BTW I had someone on another board go into a 4 paragraph diatribe telling me how that was wrong. After all the magic physics, he was still wrong.
Tom
__________________
Tom and Annie & Java
2022 Anthem 44B
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01-19-2022, 03:06 PM
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#6
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Junior Member
Join Date: Jan 2022
Posts: 2
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Tire pressure
Trying to setup TST tire monitor High and LOW TIRE PRESSURE.
Label inside coach 100 psi cold
Tire 110 psi cold
Which is right?
What should be the High pressure for TST tire Monitor?
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01-19-2022, 03:14 PM
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#7
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Senior Member
Join Date: Oct 2014
Posts: 7,881
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Quote:
Originally Posted by kenthomas49
Trying to setup TST tire monitor High and LOW TIRE PRESSURE.
Label inside coach 100 psi cold
Tire 110 psi cold
Which is right?
What should be the High pressure for TST tire Monitor?
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WELCOME!
Until you weigh it, go by the GVWR sticker (100 PSI).
After you weight it, go by your tire manufacturer's tire inflation chart for your tires and weight (plus a 10-15% addition for a safety margin).
High is pretty well irrelevant, as a large part of that variable is ambient temperature and sun.
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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01-19-2022, 03:15 PM
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#8
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Junior Member
Join Date: Jan 2022
Posts: 2
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Tire pressure
Quote:
Originally Posted by kenthomas49
Trying to setup TST tire monitor High and LOW TIRE PRESSURE.
Label inside coach 100 psi cold
Tire 110 psi cold Michelin tires 255/80R22.5
Which is right?
What should be the High pressure for TST tire Monitor?
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This is the my first time using this site. Thanks for your help.
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01-19-2022, 03:37 PM
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#9
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Senior Member
Entegra Owners Club Spartan Chassis
Join Date: Feb 2010
Posts: 4,236
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Quote:
Originally Posted by Ricci
Hi - Absolutely right. BTW I had someone on another board go into a 4 paragraph diatribe telling me how that was wrong. After all the magic physics, he was still wrong.
Tom
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Tom, since Boyle's Law is pretty well established, it must have been fun to have "magic physics" explained to you. Just a question, was it Penn or Teller who was explaining the magic? 
Take care,
Stu
__________________
"I would rather have questions that can't be answered than answers that can't be questioned."
2018 Anthem 42DEQ
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01-19-2022, 04:05 PM
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#10
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Senior Member
Newmar Owners Club Tiffin Owners Club Entegra Owners Club
Join Date: Feb 2017
Location: Fulltiming Since 2011
Posts: 1,493
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Hi Stu - No not Penn or Teller. Forrest Gump.
Tom
__________________
Tom and Annie & Java
2022 Anthem 44B
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01-20-2022, 05:14 AM
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#11
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Senior Member
Join Date: Oct 2012
Posts: 825
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I once tested it on a cold morning.
Cheap digital device.
Measuref front wheel with about 900lbs on it .
3 times on the ground, after that jacked uo , so exact zero lbs on tire, and again 3 measurements, again down 3 , up 3 , down 3 measurement, and within a inacuracy marge the pressure stayed the same . Not exactly, at the end of the 15 measurements the pressure was on the ground a bit lower, because every measurement some air escaped when pushing the device on the valve.
On this site somewhere also tested acurately
http://https://www.coyoteents.com/temperature-and-tire-pressure/
And at 10 psi , 1 psi difference, but at 35psi no difference.
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01-20-2022, 05:37 AM
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#12
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Senior Member
Join Date: Oct 2019
Location: Buena Vista, Baja California Sur
Posts: 797
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Quote:
Originally Posted by Ricci
Hi Stu - No not Penn or Teller. Forrest Gump.
Tom
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   Too funny!
__________________
Mark & Jen Rayor, Baja Ca Sur, Mexico
04 Prevost H3 45 Liberty Elegant Lady 24V
toad, Jeep Willys Wrangler
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01-20-2022, 05:52 AM
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#13
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Senior Member
Join Date: Jul 2005
Posts: 5,996
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If the air was replaced with water in entirety, Pascal's law comes into play as the tire deforms under increasing weight.
Everyone is arguing for an element they cannot measure precisely, outside of a lab.
__________________
TandW
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Linear Mode
