Tire Pressures

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Tire Pressures

Post by Lockedup » Mon Oct 01, 2018 4:53 pm

Probably talked about a lot but I am looking to see what anyone with similar setup is running for air pressure.

I have a 2017 PW with AEV lift, saltas, and 37x12.5x17 bfg ko2. Thanks


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Re: Tire Pressures

Post by BoldAdventure » Mon Oct 01, 2018 7:00 pm

Chalk test your tires for best results. That's the answer.
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Re: Tire Pressures

Post by Will » Mon Oct 01, 2018 7:06 pm

BoldAdventure wrote:Chalk test your tires for best results. That's the answer.
Yep /\ but for starters, I ran 35 rear, 42 front on hankooks. Different tires, different pressures. Go down a dirt road, then ride straight on pavement a couple miles. Stop, look at the tread. Need a full plant.


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Re: Tire Pressures

Post by FordyceCreekTrail » Tue Oct 02, 2018 9:23 am

I run 40PSI all the way around with 35" KM3s. And that seems really good now with some miles on them. On the Duratrash I tried to run 40 or so front and 35 rear but had to take the front down to 35 to avoid flats. I would say due to the soft sidewalls the Dura Trash should be run at 45 and 50, but the glass belts cannot handle it.

Certainly a big difference in ideal pressure depending on tire size, style, construction....Dont get sold on a set pressure, experiment until you find what works for that tire.
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Re: Tire Pressures

Post by PWJouster » Tue Oct 02, 2018 9:28 am

you have a great setup, but those tires do in fact appreciate the correct air pressure for ride comfort and wear quality.

Chalk test to be sure, but an empty powerwagon on those tires will be under 40 rear and under 45 front cold. thats my hypothesis.
you may think its light, but it works.

my toyo rts in 35s are at 42F38R cold. within 15 minutes of my home, i can bring these to 48 and 45 with my driving style.
i could go lower but mileage will take a further hit below 10avg MPG
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Re: Tire Pressures

Post by Lockedup » Tue Oct 02, 2018 10:57 am

Thanks everyone. Good feedback. I talked to previous owner last night and he was running 45f/40r. I’ll play around with it based on everyone’s feedback. Thanks!

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Re: Tire Pressures

Post by BoldAdventure » Tue Oct 02, 2018 12:17 pm

Thuren has some great notes about Tire Pressures on these trucks on his site too:


Notes on tire pressure

With any pick-up truck being much lighter in the rear, compared to the front, you should run less tire pressure in the rear. With the engine assembly being so heavy on these heavy Diesel Rams, that bias number is about 20psi less in the rear compared to the front, and this is assuming you are unloaded or lightly loaded. Naturally if you had a slide in camper, or a heavy 5th wheel or something, air up as you should. Different tire brands, models, and construction types can desire TOTALLY different pressures. Smaller D rates tires may like more pressure, while larger heavier E rated 10 ply tires will use much less. Start with finding a pressure for the front which lays the tread flat on the ground, then add about 5-10psi. This will usually net great handling that is not "squirmy", rolling over giving lazy handling, and wearing the outer lugs of the tires. Once you find this good front pressure, drop the rear about 20psi compared. This will net balanced tire wear, and a more comfortable balanced ride.
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Re: Tire Pressures

Post by Bill2014 » Wed Oct 03, 2018 8:42 am

BoldAdventure wrote:
Tue Oct 02, 2018 12:17 pm
Thuren has some great notes about Tire Pressures on these trucks on his site too:


Notes on tire pressure

With any pick-up truck being much lighter in the rear, compared to the front, you should run less tire pressure in the rear. With the engine assembly being so heavy on these heavy Diesel Rams, that bias number is about 20psi less in the rear compared to the front, and this is assuming you are unloaded or lightly loaded. Naturally if you had a slide in camper, or a heavy 5th wheel or something, air up as you should. Different tire brands, models, and construction types can desire TOTALLY different pressures. Smaller D rates tires may like more pressure, while larger heavier E rated 10 ply tires will use much less. Start with finding a pressure for the front which lays the tread flat on the ground, then add about 5-10psi. This will usually net great handling that is not "squirmy", rolling over giving lazy handling, and wearing the outer lugs of the tires. Once you find this good front pressure, drop the rear about 20psi compared. This will net balanced tire wear, and a more comfortable balanced ride.
I read that recommendation when he first posted it years ago. Use common sense and don't blindly follow anyone's recommendation if it puts you in a bad place. My front tire edges are still on the concrete at 70 psi - I wouldn't add his recommended 5-10psi to that and call it good like he suggests. Although, even at 65psi, my front edges wear slightly faster than the rest of the tread. :secret:
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Re: Tire Pressures

Post by PWJouster » Wed Oct 03, 2018 9:49 am

^ was that chalk tested?
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Re: Tire Pressures

Post by BoldAdventure » Wed Oct 03, 2018 11:17 am

Bill2014 wrote:
Wed Oct 03, 2018 8:42 am

I read that recommendation when he first posted it years ago. Use common sense and don't blindly follow anyone's recommendation if it puts you in a bad place. My front tire edges are still on the concrete at 70 psi - I wouldn't add his recommended 5-10psi to that and call it good like he suggests. Although, even at 65psi, my front edges wear slightly faster than the rest of the tread. :secret:
:popcorn: 70 PSI??
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Re: Tire Pressures

Post by Bill2014 » Wed Oct 03, 2018 1:24 pm

I run 65 psi front and rear - once a year in October or November I add about 5 psi to get back to 65 psi when the temps drop. Don’t use the truck for play much anymore. :(
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Re: Tire Pressures

Post by RustyPW » Wed Oct 03, 2018 9:55 pm

Bill2014 wrote:
Wed Oct 03, 2018 1:24 pm
I run 65 psi front and rear - once a year in October or November I add about 5 psi to get back to 65 psi when the temps drop. Don’t use the truck for play much anymore. :(
My kidneys would shoot me if I ran those pressures unloaded. :shock:
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Re: Tire Pressures

Post by Bill2014 » Wed Oct 03, 2018 10:13 pm

RustyPW wrote:
Wed Oct 03, 2018 9:55 pm
Bill2014 wrote:
Wed Oct 03, 2018 1:24 pm
I run 65 psi front and rear - once a year in October or November I add about 5 psi to get back to 65 psi when the temps drop. Don’t use the truck for play much anymore. :(
My kidneys would shoot me if I ran those pressures unloaded. :shock:
If I had your Toyo 35's, I wouldn't run 65 psi. The 33 Duratracs have really flexy sidewalks - the ride is smoother than you might think considering it's about 8000 pounds empty with just me in the truck! When the truck was new, I experimented with 50 psi and the steering response went to shit. When I move the steering wheel even a small amount, I want to feel the truck respond. :wink:

At 65psi, the Power Wagon rides significantly smoother than my CTD.
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Re: Tire Pressures

Post by RustyPW » Wed Oct 03, 2018 10:31 pm

Bill2014 wrote:
Wed Oct 03, 2018 10:13 pm
RustyPW wrote:
Wed Oct 03, 2018 9:55 pm
Bill2014 wrote:
Wed Oct 03, 2018 1:24 pm
I run 65 psi front and rear - once a year in October or November I add about 5 psi to get back to 65 psi when the temps drop. Don’t use the truck for play much anymore. :(
My kidneys would shoot me if I ran those pressures unloaded. :shock:
If I had your Toyo 35's, I wouldn't run 65 psi. The 33 Duratracs have really flexy sidewalks - the ride is smoother than you might think considering it's about 8000 pounds empty with just me in the truck! When the truck was new, I experimented with 50 psi and the steering response went to shit. When I move the steering wheel even a small amount, I want to feel the truck respond. :wink:

At 65psi, the Power Wagon rides significantly smoother than my CTD.
:shock:
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Re: Tire Pressures

Post by BoldAdventure » Thu Oct 04, 2018 10:18 am

Bill2014 wrote:
Wed Oct 03, 2018 10:13 pm
RustyPW wrote:
Wed Oct 03, 2018 9:55 pm
Bill2014 wrote:
Wed Oct 03, 2018 1:24 pm
I run 65 psi front and rear - once a year in October or November I add about 5 psi to get back to 65 psi when the temps drop. Don’t use the truck for play much anymore. :(
My kidneys would shoot me if I ran those pressures unloaded. :shock:
If I had your Toyo 35's, I wouldn't run 65 psi. The 33 Duratracs have really flexy sidewalks - the ride is smoother than you might think considering it's about 8000 pounds empty with just me in the truck! When the truck was new, I experimented with 50 psi and the steering response went to shit. When I move the steering wheel even a small amount, I want to feel the truck respond. :wink:

At 65psi, the Power Wagon rides significantly smoother than my CTD.
Are you running the Toyo Open Country AT/II ??
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Re: Tire Pressures

Post by Will » Thu Oct 04, 2018 10:24 am

You have 1600 pounds of extra weight?
Bill2014 wrote:
RustyPW wrote:
Wed Oct 03, 2018 9:55 pm
Bill2014 wrote:
Wed Oct 03, 2018 1:24 pm
I run 65 psi front and rear - once a year in October or November I add about 5 psi to get back to 65 psi when the temps drop. Don’t use the truck for play much anymore. :(
My kidneys would shoot me if I ran those pressures unloaded. :shock:
If I had your Toyo 35's, I wouldn't run 65 psi. The 33 Duratracs have really flexy sidewalks - the ride is smoother than you might think considering it's about 8000 pounds empty with just me in the truck! When the truck was new, I experimented with 50 psi and the steering response went to shit. When I move the steering wheel even a small amount, I want to feel the truck respond. :wink:

At 65psi, the Power Wagon rides significantly smoother than my CTD.

vie ... =13&t=2333

2010 with 37" hooves, controlled by numerous Thuren parts and Thuren Custom King 2.5's
http://forum.powerwagonregistry.org/vie ... =13&t=2333

I only do what the majority of the 4 voices in my head tell me to. In most cases, I ignore two of them because one doesn't speak English, and I suspect the other is talking to someone else.

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Re: Tire Pressures

Post by Bill2014 » Thu Oct 04, 2018 11:18 am

The 4.5 gen Laramie pigs are heavy - and the White Knuckle .188 DOM sliders add 300 pounds. And I'm not a lightweight either...
even my heavy duty receiver tongue and ball are over 50 lbs.

The thicker frame... bigger rear pumpkin... multi-link... nanny's... list goes on and on
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Re: Tire Pressures

Post by Low_Sky » Thu Oct 04, 2018 6:35 pm

Will wrote:You have 1600 pounds of extra weight?
Took some used motor oil for recycling at the landfill last week. My just-cruising-around weight over the scales was 8600 lbs (with my normal amount of crap in the truck)

A newer Laramie with sliders and a bunch of crap in it isn’t exactly light.


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Re: Tire Pressures

Post by Socalboarder » Wed Oct 10, 2018 9:25 am

I have a 2012 PW with 37x12.5x17 General Grabber X3s. I run 28 in the front and 23 in the rear. That's chalk tested and has perfect wear after over 15,000 miles. I know some will say that very low, but after almost 2 years at those setting the truck runs great on them. The truck is not overly squishy on the road and handles great around curves (it's no Porsche!). I have 3" Thuren springs, Bilstein 5160s, Thuren track bar, and control arms. As stated above, do the chalk test and it will be perfect.

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Re: Tire Pressures

Post by olyelr » Wed Oct 10, 2018 11:05 pm

Socalboarder wrote:
Wed Oct 10, 2018 9:25 am
I have a 2012 PW with 37x12.5x17 General Grabber X3s. I run 28 in the front and 23 in the rear. That's chalk tested and has perfect wear after over 15,000 miles. I know some will say that very low, but after almost 2 years at those setting the truck runs great on them. The truck is not overly squishy on the road and handles great around curves (it's no Porsche!). I have 3" Thuren springs, Bilstein 5160s, Thuren track bar, and control arms. As stated above, do the chalk test and it will be perfect.
Thats very low :D

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