Tire PSI in new Denali HD
 

The sticker on the door lists 60psi front and 70psi rear,

Why? Is the extra psi in the rear for the anticipated extra weight from hauling a load?

If so, is there a reason to use the higher psi if I am not doing any towing?

Or is there a reason to not use the 70psi front and rear just to keep things easy?

Id do what the door recommends, on my F250 I run the same front and rear towing or not

My 08 Dodge 2500 says 60 front and 70 rear, but I keep 60 all around and got 85K miles out of the first set of tires. Book does state that light loads the rear tires can be reduced.

On my 2500 HD with E rated tires I usually ran around 55 lbs. unload for better ride quality and would air up when towing. But that was before TPMS. You may be tripping the TPMS light running lower pressures. I'm sure this can be changed with programming.

IMHO, they ride like schit at that air psi. Our roads are brutal around here.

Set where you like it ride quality wise - we are all different - but I prefer 45lbs or so when unloaded. When loaded, I crank them up.

BTW: I can't stand TPMS.

TPMS is the devil. My wife had a Honda Accord that said to run 32 lbs. on the door sticker and it would trip the light at 30 lbs. WTF??!!!

Try being a repair shop in the northern prt of the NE.

40* everyone comes in.
15-20*F everyone comes in again.
0*F everyone comes in again.

And f*k me ! At -15*F--20*F everyone comes in again.

Repeat !

Who's the schit bag who got rid of full service gas stations ?

Errrrr.

LOL.

Nitrogen fill is the way to go IMO

I don't agree for my area....unless for race cars you you actually really need it..

I run 50psi in mine all the time. It just rides too rough with the higher pressure. I had my dealer change the program so that it doesn't trip the TPMS

Air we breath is 78% Nitrogen. It's free.

I am running 33s on two F350s and 36s on the other. I keep them all at 70 & 72 and when the pressure drops for whatever reason I can tell just by the ride and milage. I can really notice the differance with the 36s.

Ran 50 front & 60 rear in my F350 dually, center of the rears wore 3 times faster than the sides. Ran 50 in all 6 better ride & wear pattern. Sold the POS after 180K and went back to Ram.
BTW 2004 6.0. Need I say More.

You are correct the higher pressure in the back is for more carrying capacity. I am guessing your truck has LT265/60R20 Load Range E tires on it. They have a carrying capacity of 3195LBS a tire at 80psi. Meaning your back axle if the tires were inflated to 80PSI could in theory (a least the tires) carry 6390lbs safely. I don't have the load inflation table for your tires in front of me, but I am guessing it is in the glove box, you would be surprised how low the back can be when your unloaded (I am guessing around 40PSI). The problem is that the vehicle manufacturers can not recommend a loaded and unloaded tire pressure, because it is not practical for people to increase and decrease their tire pressures based on what they are doing. So they recommend the safest tire pressure that can carry the load the vehicle was rated for, while still giving he best ride.

Tire manufacturers and vehicle manufacturers are always in a constant battle of running the lowest (softest) air pressure, it helps cars and trucks ride better. If you remember the Ford Explorer, Firestone thing from a few years ago that was caused in part because of the recommended air pressure by Ford of ( I don't remember I think it was 26psi). Couple that with the fact that most people do not check their air pressure you have Explores running around at 15-20 psi.

LOL, Same thing in WI. Coupled with cheap import alloy's and Calcium Chloride to keep the roads clean = bead leaks, biggest pain in my @$$.

I also have a 15 denali hd and it runs 62 or so in the front and 70+ in the rear. I have stuck to the recommendation of the manufacturer. I change oil ever 5k miles and rotate tires ever 5k in hopes that they wear evenly. I may try and even them out after reading some posts here. Congrats on the truck. I'm in love with mine.

Yep but need nothing but nitrogen. I have found nitrogen fill to stay within 2 psi from -15 to 100 degrees. Mind you I don't check constantly but every time I do check the pressure is within that range. The big payoff is rotating the tiers and having even wear across all of them is great. As before 85K out of my first set of tires is proof to me. Would have got more miles but sidewall wall was cut by a concrete.

Just my opinion, ya'll do what you want

Yeh, top of my head the Explorer's called for 28psi. I set at 34-35psi. Rode better with better tire wear. When the Firestone/Ford thing went down I shook my head the whole time and kept saying 'WTF would you run 28psi in a high, thin, swaying SUV, let alone any other car."

And that's why nitrogen is useless around here. Way too many bead seal leaks...oh, and the nails/screws in the spring. I do approx 150-200 tire repairs during mud season. Just a 2 person shop.

i run 55 psi in all my trucks till i start towing .. i got an air compresser to change the amount .. im running 35 toyos on my trucks and they just ride awsom at 55 psi .. and there such a well built tire you can air them down for rock crawling so .i guess a little under inflated cant hurt that much .. but ride quality out weighs all my other concearns on anything i drive .. 10 pds of air pressure surly isnt going to break a tire .. it will help on traillering though ..

I'd run the psi as noted on the tire sidewall. Running it low esp when towing will cause heat to build in the sidewall and then run the risk of potential blowout. I run 50psi in the 35" E rated Generals.

70lbs in the rears of a dually unloaded is like driving around w/ roller skates as wheels....

I have 2015 Denali 3500 crew dually, I run 45 psi in my rear tires when not towing and adjust to the load when I do. I dropped the front pressure by 10 lbs of factory spec for a better ride but it still does not come close to the ride my 2001 8.1 Chevy crew dually has.

Truck mfg "recommended" tire inflation is CYA as much as anything. They recommend inflation for full load.
You can definitely air down which will give better tire wear. Running 70+psi unloaded will usually result in greater tire wear in the center of the tread, loaded the tire will flatten out and wear even.
I find 60psi to be about right with my topper but unloaded.
I could not find a full chart of tire size vs pressure vs weight rating. Attached is a Ford truck link example. This is per axle so cut the weight in half per tire.
http://cimg2.ibsrv.net/gimg/www.f150...0e9df0b167.png

Due to government regulations for TPMS parameters that do not consider the differences between a near constant loaded car versus a variable loaded truck, it will alarm higher than comfortable or (prudent for unloaded trucks).
2015 TPMS is much better than the first years of TPMS with my 2008. I have a dash light at 68psi on the rear. About 2010, they lowered it to a more reasonable level.
IF you are wanting TPMS changed, it is possible but finding someone with a Tech 2 that is willing to do it may be a challenge. The value is stored in the BCM (Body Control Module). Instructions can be found searching DieselPlace.com forum.