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PSI for 35" tires?

03blackz71
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03blackz71 Senior Enthusiast

03blackz71

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I am wondering what everyone is setting there 35" tires PSI at. I just put on 35x12.5x18 BFG KO2 on stock trailboss rims and they set them at 36 psi. I was think of going up to the stock 41 psi. What is everyone else using?

CamGTP Senior Enthusiast

CamGTP

Posted
Posted

Do other peoples numbers really matter though?

 

In the end you are going to decide on a pressure based on how you think it feels. More pressure just means a firmer ride, so kinda find a happy medium. Filling them to a certain for spec for fuel mileage is already out of the question lol, those heavy and wide ass tires are going to make that number tank.

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03blackz71 Senior Enthusiast

03blackz71

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I set the front to 41psi and rear 39 psi.  It rides great and my gas milage  didn't really change yet.

eppieguy Senior Enthusiast

eppieguy

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Use the chalk method and see what pressure they make the best contact with the ground.

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J2Jones Enthusiast

J2Jones

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I'm running 35x11.50 Ridge Grapplers.  I run them at 37 psi as I've noted that with sustained highway driving, they really heat up and generally end up around 40-41 PSI.

swathdiver Senior Enthusiast

swathdiver

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BFG and Nitto are two manufacturers that I know of who have already figured out what pressures we ought to be running with their non-stock sizes on our trucks.  For our 35 x 12.5 x 18 Nitto Trail Grapplers, Nitto says 40 psi for example.

Transient Senior Enthusiast

Transient

Posted
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Would the same math for figuring correct gearing be applicable here?  Going from the stock 275/65-18 to a 285/75-18, for example, would change the gearing from 3.23 to 3.51 (good luck finding that).  Using the same variable, would that make the new tire pressure be 37-38 psi (utilizing same example at beginning of post)?

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03blackz71 Senior Enthusiast

03blackz71

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After riding on them for about a week, I might drop the psi down some.    I am not getting full tread contact to the road.   Might try 37 front 35 rear.

redwngr Senior Enthusiast

redwngr

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Every tire size / load rating has a load vs recommended pressure table. 

 

Best to know the axle loads when using them.

Daily driver not carrying anything but driver is likely heavier on front than rear.

Loaded to vehicle max, the rear will likely be higher. 

 

In any case, fully loaded vs nearly empty will have different recommended pressures.

 

Flotation Tire Load Inflation Chart - TirePressure.org

 

(link should come up with pressure table for various flotation tires) 

Luc1f3r Enthusiast

Luc1f3r

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Rule of thumb is the the bigger the tire the less air you need to carry the same amount of weight. I definitely wouldnt run a 35x12.5 at the factory number on the door.

redwngr Senior Enthusiast

redwngr

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2 hours ago, Luc1f3r said:

Rule of thumb is the the bigger the tire the less air you need to carry the same amount of weight. I definitely wouldnt run a 35x12.5 at the factory number on the door.

For sure.

 

Especially unloaded, since door label is for max gvw.

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RST from TN Enthusiast

RST from TN

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When I got my setup I actually emailed and got a response from Nitto, this was many years ago. However I have always done this on Nitto tires ever since. If I am on road I run 50PSI, I typically get 80,000 miles out of my tires too. When offroad then you need to run the lower pressure. These are 10ply tires. I am currently running Nitton 35x12.50

Tire size .jpg

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