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  #1  
Old 03-24-2011, 09:25 PM
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Default Tire PSI.....

Okay guys, this is turning out to be more of a tack in my ass then I originally anticipated. I recently bought new Nitto Terra Grapplers in the P285/70/17 flavor. I bought in P rated because I dont do a whole lot of hauling couldnt justify the extra weight carrying expense of a tire that could handle way more then my truck could, or than I would ever use.

Here is my problem. The tires that came off of my truck were from Firestones bottom shelf (Peerless Baja Widetrack H/T). Their max weight/ PSI rating is 2535 at 44 psi. I ran these tires at 40 psi and had 42,000 miles on them when I took them off with the most even wear God himself could ask for. And they still have 6/32 (out of 12/32) tread left and is currently in service on a co workers truck.

The Nittos I put on is max weight/ PSI rated at 2833 at 35 psi. Here lies my delimma. The recommened psi on the door jamb sticker is 35 psi. Now I dont want to run the tire too low on air, but am also worried of overinflating with the cold PSI as temprature change from night to day at almost 30 degrees here. Common sense tells me that the higher weight rating acheived by running the max in these tires will wear out the centers of the tread. Has anyone else faced this cluster freak? Thanks for any suggestions.

Oh, I have spoke with Nitto as well, they told me to run what the manufacturor suggest. Gee thanks, nice advice for someone who doesnt even warrenty their tire to give.
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Old 03-25-2011, 08:33 AM
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It depends on the tire itself more than anything. I face the same issue with my tires and I run them 3-5 psi lower than recommended to promote more even tread wear. If I know I need the extra load carrying capacity, I'll air up before hand.
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Old 03-25-2011, 09:08 AM
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i always thought the sticker inside the door was saying what you need in the stock tires?i might be wrong though..

and i always go by what the tire says or just under,unless on the beach
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Old 03-25-2011, 09:18 AM
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That's the recommended pressure for that size tire.
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Old 03-25-2011, 09:40 AM
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oh i got ya i knew it was something like that
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Old 03-27-2011, 06:15 PM
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I was told the psi on the door is for stock size. If you go bigger, you add some psi to adjust and not too much, unless you are really hauling or carrying a big load.
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Old 03-27-2011, 06:29 PM
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Did your truck come with a Load Range specific tire? 44 psi sounds like a Load Range D tire. 35 psi is common for non Load Range rated tires, meaning just plain ole 'P' or non 'P' tires. One thing to make sure of is that if your truck came from the factory with Load Range 'D' or Load Range 'E' tires (like 2500 and 3500); then never substitute a lower tire. There are many times that accidents will be blamed on improper equipment, meaning tires rated too low for the vehicle they are on. Just be safe...and 35 psi is a good pressure to run at IMO.
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Old 03-27-2011, 06:59 PM
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The sticker PSI is for the stock tire size. Run the tires at or below the mfgr's max psi. You might have to fiddle with the best pressure and remember psi will grow as the tires heat up.

While it is true that the center of a tire will wear out first if they are overinflated, that would be significantly above max psi.
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Old 03-27-2011, 09:10 PM
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Quote:
Originally Posted by latitud View Post
Did your truck come with a Load Range specific tire? 44 psi sounds like a Load Range D tire. 35 psi is common for non Load Range rated tires, meaning just plain ole 'P' or non 'P' tires. One thing to make sure of is that if your truck came from the factory with Load Range 'D' or Load Range 'E' tires (like 2500 and 3500); then never substitute a lower tire. There are many times that accidents will be blamed on improper equipment, meaning tires rated too low for the vehicle they are on. Just be safe...and 35 psi is a good pressure to run at IMO.

Its only a half ton. The door placard lists the tire size as P245/70/17. The build sheet says the truck left the plant with P265/70/17, and thats the size that was on there when I bought the truck, so IDK maybe someone at Dodge got mixed up with that or something.

A few calculations on the P rated tires I put on there. If I am mistaken in any of these calculations, someone correct me.

The tires are rated for 2833 pounds a piece. So 2833x4= 11,332 pounds
Have to - 10% because its a truck. Dont know why, just what i have always heard but whatever. So 11,332-10%= 10,198 pounds

Ive never had my truck weighed but did research a bit and found that a 4 wheel drive similarly equipped as my 2 wheel drive weighs 5,000 pounds. So I assume that I am a bit lighter, but Ill use the excess to widen the safety margin.

So, 10,198-5000= 5198 pounds left for payload.

Now being that most payload will be in the back of the truck, divide that number in half, 5198/ 2= 2599 pounds remaining.

I couldnt imagine hauling 2599 pounds in the back of my truck, period. I am almost sure that that is way beyond the weight capabilities of the truck, making the more expensive rough riding LT tires downright silly, especially since the truck came with P rated tires rated at a lower capacity. The most I have ever hauled in the bed of a truck at one time was maybe 500-600 pounds, and I have a max tongue weight of 500 pounds on my hitch so towing checks out too.

I feel when deciding on these I have gave myself a very broad margin in the calculations and still havea lot left over. If I am mistaken in any of my calculations, I hope someone does correct me.
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Old 03-28-2011, 10:23 AM
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Quote:
The tires are rated for 2833 pounds a piece. So 2833x4= 11,332 pounds
That is correct for MAX INFLATION pressures. If you run below MAX, then your weight carrying drops off. However, I can't find anything that says a P245/70R17 will carry 2833 lbs. The below information is the industry standard published in the Tire and rim Association book. This is the standard publication used by all tire manufacturers.
P245/70R17
35 psi - 2205
32 psi - 2116
29 psi - 2017
26 psi - 1918
These are with a load index of 108

P265/70R17
35 - 2535
32 - 2425
29 - 2315
26 - 2194
load index 113

The below information is from the ETRTO standards manual, again, used by all tire manufacturers.
245/70R17
35 - 2332
load index 110

265/70R17
35 - 2673
load index 115

Now - there are ocassions when tire can vary from the standards, provided that the manufacturer has tested them at higher than standard load levels and has documentation to support the higher loads.
Likely the door placard is correct for the standard truck options, the P265/70R17 was probably part of an options package and there was/is probably a tire supplement guide in the glove box that addresses this. If your sidewall says MAX COLD INFLATION 35 psi, then you should be ok to run 32 to 35, without issues. The ride will be stiffer and the centers will wear more at 35, but I would feel more safe at 35 psi, since it is a truck and since most people load the bed with some additional weight without ever pumping up the tires....just do what you feel comfortable with.
Just out of curiosity, why would you downgrade from the P265/70R17?
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