Is there a rule of thumb?
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JK Newbie
Joined: Sep 2009
Posts: 33
Likes: 0
From: Northern RI
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
What should I set the pressure at? Is there a rule of thumb for setting pressure? Thx
What should I set the pressure at? Is there a rule of thumb for setting pressure? Thx
Super Moderator
Joined: Jun 2011
Posts: 11,054
Likes: 85
From: Hendersonville, Tennessee
Originally Posted by wayoflife
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.
JK Junkie
Joined: Jan 2010
Posts: 3,796
Likes: 3
From: Stokesdale, NC
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.
If the chalk mark is worn off more in the center than at the edges, as shown here, the tire is over inflated.
If the chalk mark is worn off more at the edges than in the center, as shown here, the tire is under inflated.
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.
If the chalk mark is worn off more in the center than at the edges, as shown here, the tire is over inflated.
If the chalk mark is worn off more at the edges than in the center, as shown here, the tire is under inflated.
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JK Enthusiast
Joined: Feb 2012
Posts: 265
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From: bakersfeild,ca
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.
If the chalk mark is worn off more in the center than at the edges, as shown here, the tire is over inflated.
If the chalk mark is worn off more at the edges than in the center, as shown here, the tire is under inflated.
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.
If the chalk mark is worn off more in the center than at the edges, as shown here, the tire is over inflated.
If the chalk mark is worn off more at the edges than in the center, as shown here, the tire is under inflated.
JK Newbie
Joined: Nov 2011
Posts: 80
Likes: 0
From: Pensacola, FL
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.
If the chalk mark is worn off more in the center than at the edges, as shown here, the tire is over inflated.
If the chalk mark is worn off more at the edges than in the center, as shown here, the tire is under inflated.
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.
If the chalk mark is worn off more in the center than at the edges, as shown here, the tire is over inflated.
If the chalk mark is worn off more at the edges than in the center, as shown here, the tire is under inflated.
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.