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jimh425

Western MT

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Posted: 06/19/19 07:46am Link  |  Quote  |  Print  |  Notify Moderator

If you are seeing a pretty large increase in pressure, it’s possible that’s being cause by the tire overheating by being at low pressure.

Not a good thing to run really low rear pressure in your DRW. First, you would be way over capacity if you ever had a blow out which could cause the other tire to blow. Two, you are increasing the chance of the two tires making contact with/without a minimal object. Third, you are reducing the stability by using the tire below it’s recommended range on your vehicle.

Frankly, I think the better ride is likely mostly in your head. I do wonder why you bother with a DRW if you are going to reduce it’s load capacity to a SRW and remove your redundancy. Doesn’t seem to make a lot of sense. I’d look into better shocks and/or reducing the air in your airbags.

My F450 sticker says 80 Front and 75 Rear. That’s what I run since I don’t hardly ever drive it empty and 19.5s are different style of tire bead. Conventional E rated DRW recommended pressure on the Rear is 65 though, right?


'10 Ford F-450, 6.4, 4.30, 4x4, 14,500 GVWR, '06 Host Rainer 950 Dbl Slide, Torklift Talon tiedowns, Glow Steps, and Fastguns. Bilstein 4600s, Firestone Air Bags, Hankook DH-01 225/19.5 Fs, Curt front hitch, Energy Suspension bump stops.


Arcamper

Fayetteville, AR

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Posted: 06/19/19 08:00am Link  |  Quote  |  Print  |  Notify Moderator

TxGearhead wrote:

I run 75-80 in front, loaded or unloaded.
I may have some extended interstate running today. I'll lower the rears to 36-38 and see how it acts.


This is what I have done for years. 65psi+ in the rears empty is just to rough with no weight on it. 40 makes it much better and the tires are wearing even and do not run hot. Always 80 in the fronts.


2016 Montana 3100RL Legacy(LT's,Joy Rider 2's,disc brakes)
2014 Ram 3500 DRW Laramie Cummins/Aisin 14,000 GVWR
2014 Ford Expedition Limited, HD tow pkg
2016 Honda Civic EX-T
1999 Stingray 240LS
1994 Chevy 1500 5.7 PU
2018 John Deere 1025R
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Greg B

Minnesota

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Posted: 06/19/19 07:25pm Link  |  Quote  |  Print  |  Notify Moderator

I've always dropped the rears down to 35-40 when running empty. Much better ride and more even tire wear.


04 Dodge 1 ton dually, Cummins, auto, quad cab, 4x4, SLT, Sport, Reese Titan V

04 Lance 1161, TV/DVD, high efficiency A/C, Honda EU2000

TxGearhead

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Posted: 06/19/19 07:45pm Link  |  Quote  |  Print  |  Notify Moderator

Jimh425 the ride quality is most certainly not in my head. As for as why I have a Dually, it is for the cabover camper. I don't drive around with the camper on it all the time. Airbags? What airbags? If you're running airbags you need more truck.
I dropped the rears down to 38psi this morning, drove 250 miles at freeway speeds, 65-75mph. Pressure rose to 42psi per the Ram tire monitors. 95F ambient temp.
Think I'll take them down to 36.

* This post was edited 06/19/19 07:51pm by TxGearhead *


2018 Ram 3500 CC LB DRW 4X4 Cummins Aisin Laramie Pearl White
2018 Landmark Oshkosh
2008 Bigfoot 25C9.4
2014 NauticStar 21 ShallowBay 150HP Yamaha
2016 GoDevil 18X44 35HP Surface Drive

jimh425

Western MT

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Posted: 06/19/19 08:03pm Link  |  Quote  |  Print  |  Notify Moderator

TxGearhead wrote:

Jimh425 the ride quality is most certainly not in my head. As for as why I have a Dually, it is for the cabover camper. I don't drive around with the camper on it all the time. Airbags? What airbags? If you're running airbags you need more truck.
I dropped the rears down to 38psi this morning, drove 250 miles at freeway speeds, 65-75mph. Pressure rose to 42psi per the Ram tire monitors. 95F ambient temp.
Think I'll take them down to 36.


Yeah, I only have a F450 much too little of a truck. That’s the “only” reason I have airbags. [emoticon]

Do what makes you happy, but why not go to 25 or putting it to another way when do you know if you are low enough? [emoticon]

Kayteg1

California > Nevada

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Posted: 06/19/19 08:04pm Link  |  Quote  |  Print  |  Notify Moderator

Michelin inflation tables
As I said, manufacturer give inflation tables as you can see on Michelin sample I pasted above.
In my case the tables start at 35 psi, what give the tire ca 1800 lb load capacity. My empty dually has about 1/2 of that, but don't think I would drive it with 18 psi in rear.
Even Michelin is not highlighting it, the 35 psi is min they allow.





zcookiemonstar

Midwest

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Posted: 06/19/19 09:06pm Link  |  Quote  |  Print  |  Notify Moderator

Those of you that are running 70-80 psi in the front of your Dodges or Rams what does your door tag say for the fronts? Mine says 65psi and that is what I run but they always look a little low. What benefit do you get out of the higher pressure?

eHoefler

ozark mountains

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Posted: 06/20/19 06:11am Link  |  Quote  |  Print  |  Notify Moderator

zcookiemonstar wrote:

Those of you that are running 70-80 psi in the front of your Dodges or Rams what does your door tag say for the fronts? Mine says 65psi and that is what I run but they always look a little low. What benefit do you get out of the higher pressure?


2019 with Max Tow option
80 psi in the front

My 2014 was 80, and my 2010 was 80 as well


2019 Ram Limited, 3500, Crew Cab, 1000FTPD of Torgue!, Max Tow, Long bed, 4 x 4, Dually,
2006 40' Landmark Mt. Rushmore

Marcela

Kansas

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Posted: 06/20/19 06:26am Link  |  Quote  |  Print  |  Notify Moderator

Go to the inflation/load tables, somewhere it will say the lowest recommended pressure is listed in the table. Usually 30-40 psi. I got tired of looking at the tpms alert and took them down 12% below what is recommended or whatever is allowable without setting it off, and you can go to the dealers and they might alter the parameters.

Big difference on ride.

TxGearhead

Texas

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Posted: 06/20/19 07:34am Link  |  Quote  |  Print  |  Notify Moderator

zcookiemonstar wrote:

Those of you that are running 70-80 psi in the front of your Dodges or Rams what does your door tag say for the fronts? Mine says 65psi and that is what I run but they always look a little low. What benefit do you get out of the higher pressure?


80 front
65 rear

When the truck is empty a fair percentage of the total weight is on the front tires, particularly if it's a diesel.

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