truck tire pressure

[look 171]

Which is it? I always go by the tag on the door jamb and not the tire psi, but in my Duramax that calls for 60 up front and 70 (I think?) lbs in back. Every time I take my truck in for service those guys seem to like to pump them up to 65 lbs on all fours. I last three blocks on my drive home and must air down because my fillings starts to fall out. I normally run all fours at 40-42 lbs. This is a 4WD truck. If I have to tow or carry a heavy load, I pump them up to 50-55 depending on the load. You?

[dad911]

Trailers I use the sidewalls. Trucks I use the doorjamb.

[VINMAN]

Stock tires I go by the door sticker. any aftertmarket i go with the tire specs

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[look 171]

Really you guys pump them up to 60 psi for regular driving?

[look 171]

I jsut found this.

California passed a law in September 2010 concerning air pressure. It roughly states that: in order to reduce greenhouse emissions caused by underinflated tires, all auto shops are required to set the air pressure in any car they work on to the vehicle manufacturer's specifications (usually found on the door placard). That's all well and good, we want to decrease greenhouse emissions, but there's a problem, for easily more than half the vehicles we work on, the vehicle manufacturers specifications are either patently too low (for this area), or barely adequate. So in order to reduce greenhouse emissions caused by underinflated tires, we were required to underinflate them(!?). Fortunately, they soon realized this, and issued a clarification to the law that they would allow us to put more air in the tires if the customer requested it. We are still not allowed to go lower.

[Arizona_928]

Originally Posted by look 171

Really you guys pump them up to 60 psi for regular driving?

I keep my rears at 80. 70 in front.

[DerkPerk]

I run 35” tires on my 3/4 ton diesel. Max load rating per tire sidewall of 65# in the front always. When running empty load, 55# in the rear. Go to 65# rear when hauling.


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[VINMAN]

I see tire pressures all over the map. I have friends with identical truck set up and tires one will run 70, other will run 40.

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[look 171]

Originally Posted by VINMAN

I see tire pressures all over the map. I have friends with identical truck set up and tires one will run 70, other will run 40.

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I am at 45 normally. The truck is usually empty when I drive it.

[Evans, Marv]

When I had my F350, I ran 55 all around empty or light loaded. The few times I hauled or towed loads, I pumped the rears up to the specified 70 lb.

[billybek]

The load on the front of the durmax truck never changes too much and I run the 60# as recommended.
Not towing, I drop the rears to 70#. Bump them up when I have the trailer on.
YMMV.

[Arizona_928]

Very dependent on the ply(letter rating) of tire. I run E ratings so 80 psi gets you highest lbs rating and probably the best mpg (avg 23 mpg at 60 on my deleted Cummins). I also don't daily the truck.

[rfuerst911sc]

I go by the door jamb sticker on my Duramax dually 4x4 . One thing to keep in mind is diesel engines from the big three are heavy ! A lot of weight on the front before you even load anything . Yes you can get a softer ride by airing down but I don't do it . My dually is a brute and rides like a brute . I know and accept that .

[Nickshu]

Most HD trucks come with either D rated or E rated tires. I run the door jamb when not towing and the max pressure on the sidewall when towing, particularly on the rear. For D rated that should be 65 psi and for E rated should be 80 psi...or maybe I have that backwards but you get the idea.

[javadog]

You should run the pressure suggested on the vehicle placard but think of them as minimums. The pressure on the sidewall of the tire is the maximum pressure that the tire manufacturer wants you to use. It’s not the burst pressure of the tire, that is far higher. But there are reasons they suggest it.

Usually, vehicle manufactures will give recommendations for increasing the pressure on one or both axles when the vehicle is heavily loaded. Since the manufacturers have tested the vehicles under all sorts of conditions, assume they know what they were doing. You can deviate from their suggested pressures, just be aware that the handling of the vehicle may change, especially if you just increase the pressure on one axle.

[VINMAN]

My Superduty recommends 80 front 75 rear ( as per vehicle tag..). Have aftermarket
larger tires. I usually keep them at 50. Ill bump them up if I'm towing heavy.

The Ram is pretty much the same 75 front 65 rear. Those I keep at 50.

Both trucks I keep an eye on the wear pattern also to see whats working.

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[masraum]

I thought the sidewalls of tires were supposed to be "max" press, not necessarily recommended press. I would go with what the car manufacturer recommends, but then I generally adjust a bit based on how I feel the car handles, rides, and the tires wear.

[javadog]

Originally Posted by masraum

I thought the sidewalls of tires were supposed to be "max" press, not necessarily recommended press. I would go with what the car manufacturer recommends, but then I generally adjust a bit based on how I feel the car handles, rides, and the tires wear.

Correct.

[908/930]

The front should likely stay at what manufacturer suggests, lower pressure will just add heat and wear out the tires faster, they already wear out fast enough, lower the rear a little when empty. The front end of that truck is likely the same weight as most cars. I spoke with an engineer at Yokohama tires years ago when I installed larger 33" and wider tires on my Toyota and was trying to work out what pressure to run, he just went by weight, ended up basically the same as door sticker.

Send a email to the tire manufacturer and ask them what the lowest recommended pressure is for your truck weight. Is this a 2500HD and you want it to ride nice, LOL.

[Baz]

I've never paid attention to the door jam label(s). I'll have to look.

Usually 40 lbs is about right so that's what I generally shoot for.

If I'm going a distance and/or carrying a load I will increase appropriately.