Is there a rule of thumb?
 

Got a set of new Nitto's, Max pressure is 35 psi. Installer inflated to 35 psi because of the TPMS. Yes it rides like a rock:mad: What should I set the pressure at? Is there a rule of thumb for setting pressure? Thx

Ideally, you should run them at a psi that gives your tread a good, flat and square footprint. With 35's, I find that something closer to 28-30psi will get you there.

Agree. 28 lbs gives me a flat tread pattern and good ride with my 35" Trail grapplers

I use the old chalk method....

Park on level ground and aim front tires straight ahead.

Draw a line completely across the tread.

Pull ahead 2-3 tire revolutions or until the chalk starts wearing off.

If the chalk mark is worn off equally across the width of the tread, the inflation pressure is correct.

http://www.nitrogentiremachine.com/image04.jpg

If the chalk mark is worn off more in the center than at the edges, as shown here, the tire is over inflated.

http://www.nitrogentiremachine.com/image05.jpg

If the chalk mark is worn off more at the edges than in the center, as shown here, the tire is under inflated.

http://www.nitrogentiremachine.com/image06.jpg

28 psi with mine

As previously stated, 28-30 should be good. I actually run less in the back then in the front because of the weight distribution.

Thx for the responses

Hmm...I'll have to air mine down and see how the ride feels. I'm currently at 35psi for my duratracs.

that a cool trick i need to remember that

I'd agree with using this method. Its about the most accurate (for obvious reasons). When I picked my JK up, my front tires where at ~44psi and the rears where at ~38psi (255/75/17). I still need to chalk test them, but I'm running them all at 32psi and they seem to be doing great.