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Unread 11-11-2013, 06:58 PM   #1
riot1987
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Lowest tire pressure w/o beadlocks for a ZJ

I have 16"x8" rims with 315/75/16's. They are load range E.

I was wondering if anyone has suggestions on how low I can go in em before the pressure is too low and I lose a bead? I ran 16 lbs in them last weekend and they did pretty good. I know that they're not going to crush down too much because they are a heavier tire but Id like to take em a bit lower. I wheel mostly on rocky trails and snow in the winter. I read some other threads but they were all for TJ's it seemed.
Thanks dudes

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Unread 11-11-2013, 09:13 PM   #2
SDHarleydad
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I had a similar set up on my Nissan. I had BFG KOs. i wouldnt go below 15lbs....and in the soft sand, they were great
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Unread 11-11-2013, 09:17 PM   #3
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You'll be fine down to about 10psi
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Unread 11-11-2013, 09:46 PM   #4
riot1987
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With the same width tire(12.5" in my case), an 8" wheel would hold a bead better than a wider wheel at lower pressure, correct? Or do I have this backwards?

10 PSI? Sweet. I was thinking around 12 would be the lowest. Last weekend it performed well at 16 but was still a bit rough so 10psi will help.
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Unread 11-11-2013, 09:47 PM   #5
Y0ungGunZJ
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assuming those aren't BFG all terrains, you can run just under 10 but to 8 if you really need a giant footprint i.e. super soft sand. I can't speak for snow wheeling. But you will be fine at 10 in the rocks but there is no guarantee that you won't pop a bead at some point, but how often do you really have this happen on a run?
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Unread 11-11-2013, 09:51 PM   #6
SDHarleydad
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Quote:
Originally Posted by Y0ungGunZJ View Post
assuming those aren't BFG all terrains, you can run just under 10 but to 8 if you really need a giant footprint i.e. super soft sand. I can't speak for snow wheeling. But you will be fine at 10 in the rocks but there is no guarantee that you won't pop a bead at some point, but how often do you really have this happen on a run?
Is that because of the stiffer sidewall on the BFGs
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Unread 11-11-2013, 09:57 PM   #7
Y0ungGunZJ
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Quote:
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Is that because of the stiffer sidewall on the BFGs
part of it maybe, but it is all on how that bead sits on the wheel, i'll have the all terrains, leak a little if I'm at 10lbs or less on the rocks and I get on a rock just right I would hear a little bit of air come out. but yet get some KM2 to the same pressure and they don't have that issue.

another reason could be how the bead is made on an all terrain like there is less steel in there verus a KM2 or a MTR. those all terrains are they only off road tire that I know of to have the "bead protector" on their tires.

that is just my guess, I just change tires for work and go wheeling.
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Unread 11-12-2013, 06:24 PM   #8
riot1987
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is 10 psi too low to drive back home on the highway? Probably not recommended eh
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Unread 11-12-2013, 06:38 PM   #9
WhiteOut
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Yeah, way too low. If you're gonna do that, grab a compressor.

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Unread 11-12-2013, 06:47 PM   #10
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Driving home on the freeway with 10 psi is fun, hit the breaks and they scare the crap out of a tailgater!
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Unread 11-12-2013, 07:00 PM   #11
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I've driven to a gas station 5 miles at 10psi. No chance I'd get on a highway. The flex will create heat and can deteriorate the rubber. And wheeling I've successfully run 10psi with an E tire on a 4600 lbs JK many times.

Be safe.
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Unread 11-12-2013, 09:59 PM   #12
riot1987
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right on. Thanks dudes
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Unread 11-14-2013, 06:36 AM   #13
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Loose the E sidewalls too if you really want to wheel. The stiff sidewalls don't flex for crap
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Unread 11-14-2013, 07:22 AM   #14
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What kind of control arms are you running on the front?

I ran stock control arms and crush them twice....now going to go with a Clayton Long Arm on the front.

That said if you don't have beefy control arms I would run higher psi. The tires won't grab the rocks as well but it also won't put as much pressure on the control arms by contouring to the rocks.
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Unread 11-14-2013, 08:21 AM   #15
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18-20 psi was my STREET pressure when running load range E tires. You have not even started airing down until you go below 15 psi.

I normally run 8-10 psi off-road and 20-25 psi on-road with load range D tires.
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