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Old 05-20-2019, 08:34 PM
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what psi for pavement and offroad?

my first jeep has 17IN BFG MUD TERAIN T/A KM2 new tires seems high to me?
i do not want to were them out over or under the rite psi

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Old 05-20-2019, 09:31 PM   #2
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Originally Posted by mjve54136 View Post
my first jeep has 17IN BFG MUD TERAIN T/A KM2 new tires seems high to me?
i do not want to were them out over or under the rite psi
Sticker on your door jamb reveals all. Probably 35 psi.
Off road depends but 18 +/-2-3 psi

Have air with you for the ride home.

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*Also: KM's rotate every 3k miles to prevent cupping.

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Old 05-20-2019, 10:39 PM   #3
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Old 05-21-2019, 02:38 AM   #4
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I run 32 on my 17” Rubicon wheels with stock sized General Grabber MX3s. I like the pavement ride with this psi. Off road is 18 as suggested.
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Old 05-21-2019, 04:23 AM   #5
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On road I'm right around 37. Off road depends on the terrain. Sand, I'm 10 in back and 12 in front. Other off road terrain, 15-18. I'm running the stock 17" wheels with BFG MTs.
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Old 05-21-2019, 09:40 AM   #6
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35 for long highway rides
28 around town for comfort
10 Rear/12 Front when off road
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Old 05-21-2019, 09:44 AM   #7
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I also have 3 settings...

34 psi for highway or towing.
28 psi for daily
12 psi for offroad (15 if it's an easy trail)
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Old 05-22-2019, 05:47 PM   #8
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On my stock muds I was around 33 psi. You could go higher for better mpg but the ride is harsh.

My new km3 are recommended 50ish, which is way too harsh. I drive them at about 40 for a sacrifice in mpg.
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Old 05-22-2019, 05:50 PM   #9
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On my stock muds I was around 33 psi. You could go higher for better mpg but the ride is harsh.

My new km3 are recommended 50ish, which is way too harsh. I drive them at about 40 for a sacrifice in mpg.
I may up mine to 35 so see if my MPG goes up. I got 19 on my last trip of 160 miles with 75% highway.
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Old 05-22-2019, 06:00 PM   #10
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285/70/17 Kelly Safari TSRs, 34psi for highway / around town (my daily commute is ~40mins freeway driving), ~19psi off road.

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Old 05-22-2019, 06:09 PM   #11
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Another vote for 12 psi offroad...

But now I'm on beadlocks so its 6 - 8.
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Old 05-22-2019, 06:15 PM   #12
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Are you sure they are KM2s and not KMs? There is a difference.

My Chief came stock with the MT KM tires and when I did the test drive the EVIC showed 47 in all 4. The first thing I did when I got home was to drop it to 30, but the TPMS didn't like them that low. The TPMS quit screaming (figuratively) at 32, so I run them at 32 cold, all year all surfaces. No offroad. (The biggest hills around here are the overpasses on I-75)

The one thing you MUST do is rotate them frequently. Shortly after I got my Chief, there was a post on here by a member who had those tires and had not rotated them since he bought it new, and he had over 12,000 miles on it. He said they were even throwing tread blocks. They had worn uneven and were ruined.

I rotate mine between 3,200 and 3.500 miles. At the first of the month, I completed the 4th rotation at 13,500 (it currently has 14,300 after a 600 mile trip the first weekend in May). The tires are wearing evenly and have no issues. They are getting a little noisier, but with aggressive tires that is to be expected.

If you do have the KM2s, they are a little less aggressive than the KMs you might be able to stretch the rotations out a bit, but rotating a little early sure won't hurt.

I do my own rotations and do a custom 5 tire that reverses the rotation of all the tires. There are several members who disagree with me on this, but for the past 30 years, every rotation either I or my tire dealer did on all my vehicles, including 11 four wheel drive vehicles, reversed the rotation of all the tires on the ground. I never had an abnormal tire wear issue.
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Old 05-23-2019, 01:19 PM   #13
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The door sticker only applies to the tires that came with the rig or exact replacement tire. For any other tire perform the chalk test to find the proper psi. With my 35's I run 26 PSI cold for the street and 12 lbs off road. Currently have 35K miles on these tires.
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Old 05-23-2019, 01:27 PM   #14
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My stock tire was KM.
New one is KM3.

Lowest I went in the KM was about 15 psi offroad, KM3 I went to about 17. I feel like I could go much lower but my portable air takes forever and starts to weaken as it heats up.
When I get a better compressor I'll go lower.

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