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Recommended Tire Pressure dropped from 2017 2500 (20s) to 2022 2500 (20s)???

Rockcrawlerdude said:
Nobody even batted an eye that the truck was $83k? Everybody must be getting used to this inflation.
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Its a Cummins Laramie Night 4x4 with everything but ram boxes, air suspension and the 5th wheel prep... I paid invoice but NY took over 6 k, so back to sticker to get out the door. At least they gave me what I paid for my '17 4 years later, so the incremental amount to upgrade was a lot less for me than an outright purchase. To get that deal I had to trade in this summer and wait out the order, but with a spare set of wheels it wasn't so bad. I could have gambled with the value of the old truck and saved 4k in taxes but truck was worth 36k pre pandemic and 13k more at trade in this past June. Sticker $83,160, invoice was $76,560.
 
I dropped my tires from 80+ to 65 today and despite it being below zero here, it rode so much better. Getting snow Monday... maybe it won't be so light in the rear like it was the last snow. (My brain told me it was all that low rpm torque that I wasn't used to, not the rock hard tires it was delivered on!)

Thanks for everyone's input!
 
Looked up the chalk test on YouTube.

Great info. Going to do this for all my vehicles this week.

If I drop the pressure into the 40’s is the TPMS going to squawk at me?

How low can I go before I need to get AlphOBD and a bypass cable to start messing with stuff?
 
Just did the tire chalk test.

Drew a nice big fat chalk line all the way across the front and rear.

At 60 PSI (cold) all around drove about 75-100’ and the line wore almost perfectly all the way across both front and rear.

There was just a tiny amount of chalk on the outer edges (barley) front and rear.

So maybe I could drop it a couple PSI and be fine? Not sure a couple PSI is gonna make that much difference?

I’ve noticed when driving they get up around 65 PSI when warmed up. So maybe drop to 55 PSI cold and they’d be perfect for all conditions? Hot, cold, towing, hauling…

According to the chart posted earlier 60PSI (give or take) should still give Lee me in the range for the max weight the rear axel is rated for I believe?
 
MtnRider said:
Actually I was asking the OP, should have quoted him. Wondering if he has the same tires as everyone else or something different? Very odd to see the door say 65 unless they changed tires

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His 17 said 80 not the new one…
 
MtnRider said:
Curious, what is the max PSI written on the tires (and what make/model are they)? It's going to be based on that. Wonder if they changed tires because of the shortages.



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No tire changes - same Firestone Transforce HT or optinal AT tires as 2015 at least for SRW (DRW are Nexen).
Max Tire Pressure on sidewall of Load Range E tires would be 80 psi, but that is maximum not correct TP for a given truck.
Tire Size and TP for truck would be based on Tire Size and Truck weight / load rating.
TP placard on my 2015 2500 Limited with 20's was 65 Front 80 Rear. Same on my 2022 3500 Longhorn with 18's
 
2022 2500 Cummins Night Edition. Same as OP. My placard says 60 front and rear. Was amazed that placard actually matched what the chalk test said. 60 was also what another member suggested to me.
 
Crusty old shellback said:
I had the truck fully loaded and pulled a 5K trailer with it. I ran 50 all tires and had no issues. Wear pattern looked good.
Mine is a 21 Power Wagon on 35" BFG KO2s.

If you really want to know what pressure to run, do the chalk test on the tread. Plenty of videos out there of how to do it.
When I put BFGs on the truck, we set them at 50 PSI unloaded.i could see daylight under the outer edges of the tread, so I lowered it to 40/35. Went to 45/40 as it needed it. I may drop the rear down to 37 here soon. Outer edge is not fully on the ground.
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Still hung up on the tire pressure thing, trying to figure it out.

Had another member tell me same the same thing. 45 up front, 40 out back. I've noticed many others run more PSI up front unloaded. I assume this is because of the additional weight of the engine up front?

This person said the tire pressure at 45/40 passed the chalk test perfectly. When I did the chalk test at 60 all the way around it looked perfect. I know each truck is different, but just wondering why such a large discrepancy between to the two trucks? Chalk test doesn't seem complicated. Don't think I did it wrong.
 
iflyskyhigh said:
Still hung up on the tire pressure thing, trying to figure it out.

Had another member tell me same the same thing. 45 up front, 40 out back. I've noticed many others run more PSI up front unloaded. I assume this is because of the additional weight of the engine up front?

This person said the tire pressure at 45/40 passed the chalk test perfectly. When I did the chalk test at 60 all the way around it looked perfect. I know each truck is different, but just wondering why such a large discrepancy between to the two trucks? Chalk test doesn't seem complicated. Don't think I did it wrong.
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You’re overthinking it.
 
iflyskyhigh said:
Still hung up on the tire pressure thing, trying to figure it out.

Had another member tell me same the same thing. 45 up front, 40 out back. I've noticed many others run more PSI up front unloaded. I assume this is because of the additional weight of the engine up front?

This person said the tire pressure at 45/40 passed the chalk test perfectly. When I did the chalk test at 60 all the way around it looked perfect. I know each truck is different, but just wondering why such a large discrepancy between to the two trucks? Chalk test doesn't seem complicated. Don't think I did it wrong.
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2 things one you are over thinking it and two the chalk test will yeld different results for different trucks (how they are set up and what kind of gear you carry around) and between different tire sizes/brands/plys/ wheel widths
 
One thing i have learned from these forums is people are running way too much psi when not loaded, especially in the back tires. If you are running e rated tires and have no load your rear is light. 30 psi is plenty for me.

24DB4787-2031-43C4-AE00-737B65E701B8.jpeg
 
so at 32psi you can see this tire is not fully making contace as the dust etc is really light on the edges compared to the center. I have never had success with the chalk test because on an E rated tire it appears the same form 15psi to 60 psi. what I use and it works well for me is the 10% rule ie for the sake of easy math. if cold psi is 30psi when fully warmed up ie say 10 miles of highway driving it should go up 10% in psi ie to 33psi. I have always gotten good wear doing this and if only going up 10% psi you know you are not too low as a too low of tire will generate heat. if at 30psi it goes up to say 36psi after 10 miles I would say that would be too low. at this 32psi cold after 10 miles I usually am at 35 or so so I know I am close enough to not worry and according to the load table above I posted I have plenty of load capacity.

IMG_20220208_070407571.jpgView attachment 31594View attachment 31594IMG_20220208_073424505.jpg
 
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jadmt said:
I tried explaining the best I could..sorry I don't got no more lol.
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But that very outer edge has more to do with wheel width than tire psi usually….

With my stock size tires at 60 psi they wear perfectly flat i know lower would not change much but i also am not going to change my tire pressure every couple of days when i hook to a trailer or when i hook up my plow i could get away with 50 but there is not enough difference to worry about it
 
H3LZSN1P3R said:
But that very outer edge has more to do with wheel width than tire psi usually….

With my stock size tires at 60 psi they wear perfectly flat i know lower would not change much but i also am not going to change my tire pressure every couple of days when i hook to a trailer or when i hook up my plow i could get away with 50 but there is not enough difference to worry about it
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hence the 10% rule and the inflation guide and my statement I have never had success with the chalk test, the chalk test would be the exact same at 15psi but at 15psi the psi would go up when fully warmed up indicating 15psi is too low.. Fyi this is an 8.5 wide wheel which is in spec for my particular tire mounted on it.
 
jadmt said:
so at 32psi you can see this tire is not fully making contace as the dust etc is really light on the edges compared to the center. I have never had success with the chalk test because on an E rated tire it appears the same form 15psi to 60 psi. what I use and it works well for me is the 10% rule ie for the sake of easy math. if cold psi is 30psi when fully warmed up ie say 10 miles of highway driving it should go up 10% in psi ie to 33psi. I have always gotten good wear doing this and if only going up 10% psi you know you are not too low as a too low of tire will generate heat. if at 30psi it goes up to say 36psi after 10 miles I would say that would be too low. at this 32psi cold after 10 miles I usually am at 35 or so so I know I am close enough to not worry and according to the load table above I posted I have plenty of load capacity.

View attachment 31593View attachment 31594View attachment 31594View attachment 31596
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Something is wrong with your post. Only 2 of the 4 pics display. Now the tire pics are gone
 
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