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Old 01-14-2014, 07:28 PM
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what tire pressure do you run?

I've been reading a lot of different suggestions for tire pressure on jeeps. what psi do you run and why? do you run different on road and off road?

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Old 01-15-2014, 05:21 AM   #2
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do the chalk test, theres a video on you tube to tell you how. I run 28lbs with 31" 10.50 AT's

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Old 01-15-2014, 07:15 AM   #3
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I have 31x10.5's AT and run 32 psi on street and drop it to around 15 on the trail.
(Off-Roading with lower pressure allows the tire to 'wrap' around the ground/rock/etc and grip better=more traction. On-Road proper tire pressure improves gas mileage and handling.)
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Old 01-15-2014, 10:32 AM   #4
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35x13.50-15 Toyo Open country MTs. 26 psi on the road. 12-15 for most wheeling and 8psi in sand.
91 Laredo, 4.0ho, TF999, Magnaflow exhaust, Yukon rear axles, Spartan Lockers, Posi locker, 3.5 inch springs, 1"MML, 1"BL, 1"shackles, trimmed fenders, raised flares, 35x13.50s.
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Old 01-16-2014, 03:08 AM   #5
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I have 35X12.5X15 KM2's and they have a fairly stiff sidewall, so I run 26 on the highway, 12 in the mud, and 8 for on the rocks. I have never popped a bead, but at 8 psi I have spun the wheel inside the tire. Yeah I know, bead lock wheels, but my aluminum wheels look cool...lol.
'87 YJ, 4.2L built and bored, 8" of lift, 8.8 rear, AX15/NP 231J, Tom Woods drive shafts, Flat fenders, 12,000LB winch, Custom bumpers, Rattle can paint job. Never completed...
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Old 01-16-2014, 08:27 PM   #6
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I typically run ~7.5 psi off road.
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Old 01-16-2014, 08:32 PM   #7

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On road 25-30 psi Off road 2-3 psi
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Old 02-01-2014, 10:41 AM   #8
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I don't want to start a new thread over something that's been talked about this much. So I'm going to post here. I've been meaning to do a chalk test on my new tires, but haven't got around to it. My jeep is in my garage right now and I (accidentally) did a wet-tire-on-dirty-floor test. Is this patch wide enough? Or should I go 2 or 3 psi lower?

By the way they're 33x12.5x15 MT/R Kevlar's running at 27psi each.
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Old 02-01-2014, 10:53 AM   #9
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315-75-R17 Mickey Thompson running 29 psi road. Completed caulk test to check pressure and the thread is within a 1/2 inch of edges.

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