Tire pressure

[Chasemckinney]

I recently had 37x11.5x20 nitro tires I believe I was running them around 60 psi. Just had some suspension work and new tires put on (Toyo at3 wildpeak) 35x12.5x20. The shop said they inflated them to around 40psi. My door jam says front 65 rear 80. The tires just look super low on air at 40psi. I tow a 14k 5er every few months. What are you guys running for pressure? I know it will ride nicer but 40 seems low and looks low?

 

[crash68]

If your not loaded , you can probably get away with 60-65 all the way around, when towing that fiver run the rears up to 80

 

[MontanaHandyman]

I recently had 37x11.5x20 nitro tires I believe I was running them around 60 psi. Just had some suspension work and new tires put on (Toyo at3 wildpeak) 35x12.5x20. The shop said they inflated them to around 40psi. My door jam says front 65 rear 80. The tires just look super low on air at 40psi. I tow a 14k 5er every few months. What are you guys running for pressure? I know it will ride nicer but 40 seems low and looks low?

When I was running a 3500 pulling a 26' 10k trailer, I had it on good authority from a tire guy to run the tires at the max pressure on the sidewall. After talking with him I checked the owner's manual, and that confirmed what he suggested, fwiw... (and I should add, I was always running with a full load.)

 

[MADDOG]

If your not loaded , you can probably get away with 60-65 all the way around, when towing that fiver run the rears up to 80

Exactly but check the max pressure rating on the tires first.

 

[diymirage]

I run my Kendra's at 45 when empty, pump em up to 80 when hauling stuff

I used alfaOBD to lower the threshold so I don't get a low pressure light on

 

[RedcardRam]

Go with the door jam...it's there for a reason

 

[MontanaHandyman]

Go with the door jam...it's there for a reason

That would apply for unloaded, but if you're at full load, especially with a 3/4 or one ton, even the owner's manual will tell you to up the pressure

 

[sdeeter19555]

Most tire manufacturers have charts for air pressure versus load. For someone running a LRE on a daily driver that isn't actually using a truck as a truck, running them at max just wears them out and beats you up with the stiff ride.

I run my Crew Cab Silverado 2500HD at between 55 and 60psi for daily driving, 65psi if moderately loaded, and then 70-80 in the rears if loaded (and traveling for any significant distance).

My daily driver Dodge w250 with LRE 35s I run 45psi front and 38psi rear. I have nearly 50k on this set of Falken and still over 1/3 tread left (and worn well, not cupped).

A lot of it is simply experimenting...

 

[Dredger]

I recently had 37x11.5x20 nitro tires I believe I was running them around 60 psi. Just had some suspension work and new tires put on (Toyo at3 wildpeak) 35x12.5x20. The shop said they inflated them to around 40psi. My door jam says front 65 rear 80. The tires just look super low on air at 40psi. I tow a 14k 5er every few months. What are you guys running for pressure? I know it will ride nicer but 40 seems low and looks low?

35x12.5x17 - 45 rear and 50 front seems to be the sweet spot on my truck.

 

[crash68]

That would apply for unloaded, but if you're at full load, especially with a 3/4 or one ton, even the owner's manual will tell you to up the pressure

The door sticker is the pressure needed for the full rated capacity of the truck, provided they are the stock size/capacity listed on the sticker.
A lot of owners will lower the tire pressures when not hauling or towing with HD trucks to soften the ride.

 

[sdeeter19555]

The other thing to consider is the TPMS, my Chevy 2500HD are set to trigger at less than 65psi rear and less than 60psi front from factory, so limits how much you can vary things. I had the dealer drop mine to 50psi triggers (saves rotating also). I know some programmers will let you change that trigger point also...

 

[MontanaHandyman]

The door sticker is the pressure needed for the full rated capacity of the truck, provided they are the stock size/capacity listed on the sticker.
A lot of owners will lower the tire pressures when not hauling or towing with HD trucks to soften the ride.

I don't have my 3500 anymore, but if I did, I could've taken pics of the door tag, and then the manual. My door tag showed something like 60-65, and then the manual further explained that with a full load, to jack up the pressure to 80.

 

[Tulecreeper]

That would apply for unloaded, but if you're at full load, especially with a 3/4 or one ton, even the owner's manual will tell you to up the pressure

Not necessarily. The max sidewall pressure on my tires says 80 PSI. My door sticker says 75 front/80 rear. My book says those are the pressures to maintain from empty all the way up to max tow/cargo capacity.

 

[rzr6-4]

Go with the door jam...it's there for a reason

......for stock tires. When you go oversize that completely changes. OPs tires are massive at 37x11.5x20.

Stock I would be below the sticker but closer. My last set was 33x10.5x20 and I ran those 40-45psi all around. When I went up to my current 35x12x18, I was ice scatting down the gravel roads at that same PSI. Now I run 38 front and 35 rear when unloaded and go up to 40-45 with the gooseneck. Some of it will depend on sidewall stiffness, but with large tires don't be afraid to way below the sticker (as in maybe closer to half). When I changed tires sized I got close by the way it rode, when dialed it in from wear patterns over the first few thousand miles.

Note, I am not underinflated by any means. At 35 psi the sidewalls have almost no bulge and after 7k miles the treads are still a little rounded on the corners from when they were on the front.

 

[MontanaHandyman]

Not necessarily. The max sidewall pressure on my tires says 80 PSI. My door sticker says 75 front/80 rear. My book says those are the pressures to maintain from empty all the way up to max tow/cargo capacity.

I'm just going by the sticker and owner's manual for the truck I had