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  #1  
Old 04-30-2012, 06:16 PM
Ramathorne Ramathorne is offline
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Default 35x12.5x20 PSI

I am running the Cooper Discoverer STT TEK 3
Just wondering what PSI I should be running?
I am currently running 45psi
I emailed Cooper and of course no response
And I know it has to be more than the factory size 35psi on door sooo looking for some insight from ppl running the same size...
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Old 05-04-2012, 05:59 PM
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Old 05-04-2012, 11:28 PM
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Those are E rated LT type tires. You can run any pressure between 45 and 80 lbs depending upon load. With a half ton truck you probably waant to run on the light side of the range. Some people even run this type of tire at 40 lbs. You can air down in offroad situations like soft sand if you like but need to air back up on the road. Really, it all depends on what feels comfortable to you
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Old 05-06-2012, 05:00 AM
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If you are worried about them wearing uneven then take a piece of chalk and draw a line across the tires and drive a little bit then check the chalk line to see where it is wearing the most then add/remove air as necessary. Keep doing that until you have an even wear pattern on the chalk and that will then also give you your needed PSI.
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Old 05-06-2012, 10:22 AM
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Quote:
Originally Posted by Ramathorne View Post
I am running the Cooper Discoverer STT TEK 3
Just wondering what PSI I should be running?
I am currently running 45psi
I emailed Cooper and of course no response
And I know it has to be more than the factory size 35psi on door sooo looking for some insight from ppl running the same size...
Correct tire pressure isn't determined by the type/size of tire you're running but by the vehicle you put it on. The door post sticker of your truck lists the correct tire pressure for your truck, that's what you should inflate them to.
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Old 05-06-2012, 10:27 AM
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Quote:
Originally Posted by Upstater View Post
Correct tire pressure isn't determined by the type/size of tire you're running but by the vehicle you put it on. The door post sticker of your truck lists the correct tire pressure for your truck, that's what you should inflate them to.
I disagree with this statement...there is no way I'm supposed to run stock tire pressure in 35 x 12.50x 20 E rated tires...sorry

The door sticker also lists the specific tire size it is representing tire pressure for.
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Old 05-06-2012, 11:44 AM
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Quote:
Originally Posted by MadSoul87 View Post
If you are worried about them wearing uneven then take a piece of chalk and draw a line across the tires and drive a little bit then check the chalk line to see where it is wearing the most then add/remove air as necessary. Keep doing that until you have an even wear pattern on the chalk and that will then also give you your needed PSI.
This.
I run my M/T at 50psi.
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Old 05-06-2012, 03:10 PM
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Originally Posted by BLKSVT View Post
I disagree with this statement...there is no way I'm supposed to run stock tire pressure in 35 x 12.50x 20 E rated tires...sorry

The door sticker also lists the specific tire size it is representing tire pressure for.
LMAO! Why not? Is "stock tire pressure" somehow different than "regular tire pressure"? Pressure and volume are two different things, you're getting confused. Any reputable tire manufacturer will tell you the same thing.

Suit yourself though, you obviously know what you're doing...
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Old 05-06-2012, 03:57 PM
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Quote:
Originally Posted by Upstater View Post
LMAO! Why not? Is "stock tire pressure" somehow different than "regular tire pressure"? Pressure and volume are two different things, you're getting confused. Any reputable tire manufacturer will tell you the same thing.

Suit yourself though, you obviously know what you're doing...
have to agree about the pressure vs. volume. My dads back hoe tires take 20 PSI lol they are 4 feet tall and 20" wide. Its all about the weight of the vehicle and any load you might put on it, guys with diesel pick up trucks are running alot of their 35's around 45-50 and their trucks weigh 3000 pounds more.

The chalk method is the best way to determine the best psi for wear.
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Old 05-07-2012, 03:18 PM
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Default Load Inflation tables

Everyone is both partly right and partly wrong on this one. Required tire pressure does indeed depend upon the load expected. LT truck and Open Country (high flotation) tires require more pressure than P tires to carry the same load. I have attached the tire standards load inflation guide courtesy of Toyo.
Here is the bottom line for 1/2 ton RAMs:
Stock P275-60-20 is rated at 2601 lbs @ 35 PSI (as recommend on sticker)
Similar sized LT275-65-20 is only rated 1895 @ 35 PSI. To get to 2680 load(roughly equivalent to the stock tire) you have to inflate to 50 PSI
Your mud tire size isn't in the tables exactly, but at 35-12.5-18 you would need to inflate between 40 PSI (2530 load) and 45 PSI (2735) load.
You might ask what is really required based upon the RAM 1/2 ton GAWR? Well the rear axle GAWR is 3900. Divide by two and you get 1950. Ergo, to carry a maximum load all the pressure you really need in an LT tire is a bit more than 35 PSI (1895 load) and less than 40 PSI (2280 load). That brings us to practical considerations, like wear and comfort. You can't beat the chalk test for wear indication. But you should run the highest pressure that gives you even wear and a comfortable ride, also higher pressure equals lower rolling resistance equals better gas mileage. In sum, you can run 35 PSI without ill effect unless you have the truck loaded to the max. Or you can run 50 PSI to be equivalent to the stock tire load rating. Or you can run any pressure in between that you like and feels right. But there is no reason whatsoever to run at the maximum allowable 80 PSI (see the sidewall) on an LT tire.
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File Type: pdf loadinflationtable.pdf (363.3 KB, 8 views)
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