Air pressure question...

[20h4Runner]

Hey guys,

I tried using the search function but couldn't find an answer.

I'm running 285/70/17 BFG K02's. I'm wondering what's the best air pressure to run on the street/highway. I went to 2 local Kaltire's and both gave me different opinions. 1 said 32psi like the factory tires and another said 40psi. So I'm looking for real world experience from you guys.

Thanks for the help.

 

[rigtec]

Hey guys,

I tried using the search function but couldn't find an answer.

I'm running 285/70/17 BFG K02's. I'm wondering what's the best air pressure to run on the street/highway. I went to 2 local Kaltire's and both gave me different opinions. 1 said 32psi like the factory tires and another said 40psi. So I'm looking for real world experience from you guys.

Thanks for the help.

Hi 20h4Runner,

Your new tires will give you a range of psi for the optimum performance intended. But the pressure that works for you sets the ultimate protocol for your personal use! A higher pressure will tend to provide a better MPG as that will reduce excess drag or friction created between the rubber and pavement... it will also reduce sidewall flexing that allows the vehicle to sway from side-to-side as the truck corners and banks at higher speeds, so a higher 'On-Road' performance may be observed.

A lower pressure will tend to yield a softer ride as the sidewalls are allowed to expand and contract more freely... and as the tire is allowed to expand as it meets the road, the greater surface area and softer rubber carcass will increase the traction and reduce slippage and skipping across some road surfaces! I try to keep my Good*Year Eagle 275/55 R20 between 40 and 44 for a combination of both performance, good traction, and MPG! So there's no right answer to what's better; just opinionated compromises and preference based on the driver's need, Best to you,

rig!

 

[Jhalko]

Check this...

http://www.toyota-4runner.org/engin...s/110299-lt-tires-need-more-air-pressure.html

 

[BlackWorksInc]

Well depends on a lot of things, such as are these P or LT (if LT; C,D, or E rating?).

If they are P rated tires, I'd say maybe 36~40psi, LTs, probably closer to 40~46psi (depending on load rating). A chalk test might help give you a rough idea of good footprint that you can use as a baseline.

 

[wfo9]

If I had to guess. I would say 37-44psi.

It's going to depend on many factors. Chalk test will help. Look up videos for it on YouTube....

I usually just get a feel for it with experimentation. The tires should be firm but not hard as rocks. Keep an eye on how they are wearing. Get down on the ground and visually look at the contact patch and how the tire comes off it.... you want it flat not wearing more in the middle (too high) or sides (too low)

I've ran all my AT/MT tires around 40psi on the 4R.