Tire Pressure?

[cal]

I run 8 on the trail, 15 on fire roads and 32 on the street, 315/75/16 MT/R's.

 

[8Mud]

Start out around 30 PSI and watch your tire wear. I actually get better wear running the fronts a couple of PSI higher than the rears.
The fronts tend to wear a little more on the edges, so I increase the pressure just a little, to crown the tread some.
Running the rears a little low gives me a flatter wear pattern.
Tire wear is something I look at most every time I gas up and then make pressure adjustments as needed, by tire brand, number of plies and size.
Rotate your tires.

 

[NewOld96xj]

You're right I used kg instead of Lbs.. Didnt convert. My bad:thumbup: It's at 25 lbs now I'll add a few more

How do you figure that?

An XJ weighs roughly 4000#, the minimum off-road pressure given is 14 psi, for every 10mph over 20mph you add 3psi. So at highway speeds (60-70mph) you should be somewhere between 26-29 psi.

 

[karstic]

You're right I used kg instead of Lbs.. Didnt convert. My bad:thumbup: It's at 25 lbs now I'll add a few more

Remember those are just guidlines. How are the tires wearing? How is the ride? 25psi might work for your set up and your comfort level.

 

[Ecomike]

Rotate your tires.

My tires all rotate every time I drive my jeep, does that count?

:laugh2::roflmao::wave1:

 

[AJsArmor]

Local shops just air them up to whatever the max rating is on the sidewall. :doh: Wonder why they ride so rough. Best method for figuring out what pressures work for your rig is find an empty parking lot, rub a wide line of chalk across all your tires and drive it straight and slow about 20-30 ft. Examine the chalk on your tires and see that's it's wearing evenly across the tread. A lot of chalk towards the edges and worn in the middle means it's overinflated, the opposite for underinflated. You'll find that your ideal pressure is different for front and rear. Jot it down and do the same for winter time as it will be different.