Hello Everyone,I have a 2001 Monaco Night 36’ DP. My question is about tire pressure. The tires are Goodyear G 661 HAS load range H 255/70 R 22.5 The tires say max. pressure 120# I am not sure what the correct pressure should be. I have not weighed the RV but I have a Cat Scale ticket from the previous owner. He weighted it ready to travel. Full fuel gear and water.The ticket shows a total of 27,140# but 3120# of that is his toad. The front weight was 8640#. The rear was 15,380#. If I understand this right that means each front tire has 4320# on each. The rears (duallys) have 3845# on each of the four tires.The sticker in the coach says to inflate front and rears to 80#. I have looked for an inflation chart on the internet for these tires and have not found an exact match. I have found very similar Goodyears that say the rears should be at 80# and the front at 85#. When I checked the tires, they are at 90#. I would like to lower the pressure a little to help with handling. The RV has the steering box that is not adjustable and has some play in the wheel and wonders a bit at high way speed 60-65 mph. Any insight on correct pressure or where I can find a chart is appreciated.Thanks as always,Lurker

how 'bout this:661 HSA Tire Inflation Tableyou've got the right idea. inflate YOUR tires to the minimum pressure needed to carry YOUR load.

BUT, do not assume that your axle weights are perfectly distributed left/right.Add at least 5 PSI for actual weight imbalance. More if galley slide (significantly more weight on one side).

wolfe10 wrote:BUT, do not assume that your axle weights are perfectly distributed left/right.Add at least 5 PSI for actual weight imbalance. More if galley slide (significantly more weight on one side).that's right. 4-corner weights are best but absent that indivudual axle weights will do.to the OP: i re-read your post and see that you're working off the previous owner's weigh. suggest you load up as you would a trip...full fuel, fresh water and LP tanks, food, clothing, supplies, people, etc. and then get thee to a certified scale.

After doing all the heat and pressure checks, I found that the Newmar likes 100 PSI in all 6.

every time you load up and use your MH it will have different weight's on all the tires. you never load it the same each time and the weights will vary

Motor home tire pressure | Good Sam Community

RLS7201
Explorer II
Feb 14, 2019
The motor home manufacture puts a decal close to the drivers seat with recommended tire pressures on it. That should be all you need.

Richard
Tom_Barb
Explorer
Feb 14, 2019
I believe there are people here that are a little over annal about tire pressures.

For many decades truck drivers simply felt their tires to see if they were over heating. If they were over heating, they raised the pressure.

Heat will destroy a tire, heat is how they are made, heat will unmake them too.

TPMS is how we monitor heat these days, get a set, use it.
and check tire pressure each morning when cold.
Ivylog
Explorer III
Feb 14, 2019
old guy wrote:
every time you load up and use your MH it will have different weight's on all the tires. you never load it the same each time and the weights will vary

AND??? How much do you think that difference will be? Since you should weigh with full fuel and water which could make a 1500 lb difference if they were near empty does your possible difference really matter?
Chainwright
Explorer
Feb 14, 2019
So I'm no genius by any stretch, and maybe someone can clarify this for me, but why would a manufacturer put H rated and 120 psi rated 255/70 R 22.5 tires on a rig and then Recommend 80-85 psi? Aren't there tires that top out at 105 psi or 100 psi or 95 that would do the job and maybe save you money too? What am I missing?
old_guy
Explorer
Feb 14, 2019
every time you load up and use your MH it will have different weight's on all the tires. you never load it the same each time and the weights will vary
Tom_Barb
Explorer
Feb 14, 2019
After doing all the heat and pressure checks, I found that the Newmar likes 100 PSI in all 6.
rk911
Explorer
Feb 14, 2019
wolfe10 wrote:
BUT, do not assume that your axle weights are perfectly distributed left/right.

Add at least 5 PSI for actual weight imbalance. More if galley slide (significantly more weight on one side).

that's right. 4-corner weights are best but absent that indivudual axle weights will do.

to the OP: i re-read your post and see that you're working off the previous owner's weigh. suggest you load up as you would a trip...full fuel, fresh water and LP tanks, food, clothing, supplies, people, etc. and then get thee to a certified scale.
wolfe10
Explorer
Feb 14, 2019
BUT, do not assume that your axle weights are perfectly distributed left/right.

Add at least 5 PSI for actual weight imbalance. More if galley slide (significantly more weight on one side).
rk911
Explorer
Feb 14, 2019
how 'bout this:

661 HSA Tire Inflation Table

you've got the right idea. inflate YOUR tires to the minimum pressure needed to carry YOUR load.

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