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New Truck Tire Pressure Question

Jeff1759

Jeff1759

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2021 3500 SRW. Night Edition came with the 20" Firestone Transforce AT's. All tires inflated to 80 psi when picked up at dealer.
Door sticker states 65 psi front and 80 psi rear.
Wondering why fronts are at 80 psi, should I lower to 65?
Any thoughts or advice for me please?
 
Someone just read the side wall on the tire... I'd certainly lower the front to 65.
I have a 2500 and lowered my rear to 65 as well (door sticker says 70).
 
My 2020 RAM 3500 DRW came from the dealer with 80 PSI in all 6 tires! My diesel likes the 80 PSI upfront, and 65 in the rear when towing.
 
My 2500 was set with all tires well above 90 PSI when I picked it up. I would not pay any attention to how it was set when picking it up.
 
Thanks y’all.
 
Bullpin22 said:
2021 3500 SRW here and run 65 front and 60 rear. Time will tell as tread wear becomes visible. Adjust accordingly based on observations. At least that’s my plan.
Click to expand...
Just picked up my new 3500 SRW, and tires were at 80. Is there a particular reason why you chose those pressures? I know mine need to come down, just have no clue as to what. You are the first post I have seen here with an actual recommendation for a 3500 SRW. I presume it rides a lot better as well
Thanks
 
You only need the high pressures when the truck is fully loaded at max capacity.
My '21 Power Wagon was set at 65. I replaced the goodyears with BGF 35s. Lowest I could go with no TPMS fault was 55. Today while working under the truck, I can see daylight under the outer lugs on the tread, so it's not getting full contact.
Got my AplhaOBD working today and lowered the fault to 30PSI.
Lowered the tires to 40 front/35 rear. Going to run it that way for awhile and see how they wear.

Most tire manufacturers have charts for their tires that will show max weight at certain PSI. Usually in 5 PSI increments.
 
Look up your tire chart. Running over inflated tires (for your weight) is almost as bad as under inflated tires.

In my 3500 SRW I run 50 front and 45 back when not towing. Even that is probably a bit too much when empty.

I also use the tire fill alert system when filling and deflating. I have the 2 presets set for towing and not towing. I believe this system also sets your TPMS threshold as I never get a warning with the back down to 45 psi.
 
ckreef said:
Look up your tire chart. Running over inflated tires (for your weight) is almost as bad as under inflated tires.

In my 3500 SRW I run 50 front and 45 back when not towing. Even that is probably a bit too much when empty.

I also use the tire fill alert system when filling and deflating. I have the 2 presets set for towing and not towing. I believe this system also sets your TPMS threshold as I never get a warning with the back down to 45 psi.
Click to expand...
The 3500's just have monitors, there is no alert.
 
Sooo, lots of opinions on tire pressures. My new 3500 still sitting at 80+ PSI on the OEM tires. Mid Next month we pick up our RV but until then would like a smoother ride. Help!!
 
After starting this thread, I dropped both front and rear pressures to 65. I changed it a couple days ago to 65 front and 55 rear. Think I might take rears up to 60.
Feel free to play around and see what feels good for you jetlag. I'd research recommended pressures for you particular RV and air back up before picking it up!
 
jetlag said:
Sooo, lots of opinions on tire pressures. My new 3500 still sitting at 80+ PSI on the OEM tires. Mid Next month we pick up our RV but until then would like a smoother ride. Help!!
Click to expand...
The trucks are shipped with high pressure to eliminate flat spots from sitting.
Ram recommends 65 front, and 80 in the rear.
This is for liability reasons. They don't have the room on the door jamb for an entire chart. So they recommend maximum pressure, as if you're going around towing at your max capacity all the time. That way when you have a blowout, they push the fault on to you.

Personally I run 70 rear and 60 front. But I don't change it because I tow an 8k RV a lot.

Run the pressure low enough to be more comfortable, but high enough to not have a blowout.
When a tire blows, you'll know you should have run higher pressure. Please report if that happens!
 
Jeff1759 said:
After starting this thread, I dropped both front and rear pressures to 65. I changed it a couple days ago to 65 front and 55 rear. Think I might take rears up to 60.
Feel free to play around and see what feels good for you jetlag. I'd research recommended pressures for you particular RV and air back up before picking it up!
Click to expand...
Yes, RV calls for 80 so no issues there, thanks
 
Yeasty McFlaps said:
The trucks are shipped with high pressure to eliminate flat spots from sitting.
Ram recommends 65 front, and 80 in the rear.
This is for liability reasons. They don't have the room on the door jamb for an entire chart. So they recommend maximum pressure, as if you're going around towing at your max capacity all the time. That way when you have a blowout, they push the fault on to you.

Personally I run 70 rear and 60 front. But I don't change it because I tow an 8k RV a lot.

Run the pressure low enough to be more comfortable, but high enough to not have a blowout.
When a tire blows, you'll know you should have run higher pressure. Please report if that happens!
Click to expand...
Lol, I do not wish to be a Guiney pig. Thanks
 
jetlag said:
Just picked up my new 3500 SRW, and tires were at 80. Is there a particular reason why you chose those pressures? I know mine need to come down, just have no clue as to what. You are the first post I have seen here with an actual recommendation for a 3500 SRW. I presume it rides a lot better as well
Thanks
Click to expand...
So my #s are based on past HD trucks. My last personal one was an F250 with two work trucks in there. A Chevy 3500 and a F350. Both SRW and Knaphide service body. I’m always looking at the tread wear and either adjusting a few lbs or rotating.
Hopefully that makes since.
 
Here's a refference for you. Just looked up my tires.

BFG KO2 in 35X12.50R17 E rated tires.

PSI 25 30 35 40 45 50 55 60 65

Weight 1875 2155 2405 2625 2840 3000 3065 3130 3195
per tire


So as you can see, if I run the tires at 65PSI as per the truck sticker, I need to be carrying around 12,000 lbs total, truck and all.


With mine set at 40 front, 35 rear, I'm still a little heavy at 10,060lb. But my truck only weights about 7000 empty, So I probably need to lower them some more. at 7500 lbs running weight, I could go all the way down to 25 PSI, But I don't think the wear pattern would be right. SO I may just go down to 35/30 and see.

Tires are part of the suspension. SO if you have them pumped up to max PSI, the truck will ride harsher as the tires are stiffer/wont flex. Lower the tire pressure to the weight you are running and you will get a better ride quality. Just remember to inflate them when you put in a heavy load/pull a trailer.

I trust the BFG engineers to know what they are doing. BFG is our tire sponsor on our Baja race truck and I see them out at the races all the time checking everything from tire pressures, temps, to ground temps, dew points etc.
 
Last edited:
Jeff1759 said:
2021 3500 SRW. Night Edition came with the 20" Firestone Transforce AT's. All tires inflated to 80 psi when picked up at dealer.
Door sticker states 65 psi front and 80 psi rear.
Wondering why fronts are at 80 psi, should I lower to 65?
Any thoughts or advice for me please?
Click to expand...


Here you go. Easy to find. Now click on the chart for your tire type, metric or LT and look at the inflation tables.

tirepressure.com

Tire Pressure Charts

Tire pressure charts and load inflation tables to help you keep your tires properly inflated.
tirepressure.com tirepressure.com
 
Bullpin22 said:
2021 3500 SRW here and run 65 front and 60 rear. Time will tell as tread wear becomes visible. Adjust accordingly based on observations. At least that’s my plan.
Click to expand...
Well, I tried it your way and so far very nice. The ride has improved considerably.
 
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