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Unread 10-06-2009, 11:22 PM   #1
XJoutlaw
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On road/Off road tire pressure

When I go wheeling I always get stuck in the sand we have down here I have brand new Michelin Radial X's on stock rims the tire size is 235. I run at 30 psi on road and off. what is a nice psi to go down to so that I get stuck less but so that I can get on the road and make it to a gas station thats only bout a mile and a half a away to air back up with out killing my new tires? Thanks for the help.

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Unread 10-07-2009, 12:42 AM   #2
1990JEEPXJ
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when i was in the sand i went down to 15 psi and did pretty good. just dont drive fast or far on the road at that psi.
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Unread 10-07-2009, 12:47 AM   #3
aircruiser
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i run 12-15psi on the trails and 32 on road. im always worried as well about running on the road with low pressure. just dont drive fast and you will be fine.
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Unread 10-07-2009, 04:36 AM   #4
scavengerj
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Most of my driving is in the sand at the beach. Typically air down to around 20psi. That leaves a little room to go lower if/when needed.

Here are the rules most of us running on the beach follow...

Airing down isn't just about not getting stuck.
Airing down reduces the strain on your entire drivetrain especially the transmission and transfer case. Driving on loose sand with hard tires takes its toll on those components.
There is a way to determine what the optimal tire pressure is for your vehicle:
Perform the following test on a flat, level and smooth surface, fully loaded as you would be for a sand run (gas tank full, passengers, cooler rack etc. included). Measure the vertical height to the bottom of the wheel (rim) from the ground. This is your 100%, street pressure, wheel height. Now reduce this height by 25%. In other words, let out air until your wheel is 75% of the street height. Measure and record this pressure and depending on your vehicle and loading scheme, front and rear tires pressure will probably differ.
This is your optimum sand pressure. This reduction typically results in more than a 250% increase in footprint area. That is like having ten tires where you only had four. This pressure is only valid for exactly what you tested. Change vehicle, tires, wheels or load and you have to retest.
Too low a tire pressure isn't good either . . . The center of the footprint begins to well up reducing the effective footprint and creating a small “traveling hill” in the center of the footprint. This hill offers increased resistance to vehicle movement.
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Unread 10-07-2009, 06:16 AM   #5
Greenmonster138
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Air down off road, Obviously each jeep and tire is different. As scavenger said too low air pressure is a bad thing. Makes a rig unstable.
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Unread 10-07-2009, 08:05 AM   #6
RoyalXJ
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i wouldnt air to low w/o bead locks
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Unread 10-07-2009, 08:13 AM   #7
lilnapsak
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i leave mine at 30-35 on road or off
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Unread 10-07-2009, 08:18 AM   #8
chevelle4321
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Quote:
Originally Posted by lilnapsak View Post
i leave mine at 30-35 on road or off

And you probably have not been in some loose sand lol or like digging / getting pulled out.


I went down to like 10psi on my 33's last time I was @ Pismo.
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Unread 10-07-2009, 08:27 AM   #9
lilnapsak
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Originally Posted by chevelle4321 View Post
And you probably have not been in some loose sand lol or like digging / getting pulled out.


I went down to like 10psi on my 33's last time I was @ Pismo.
well considering im in nj i do alot of NJ pinebarrens sugar sand, quick sand, poop doodoo sinkage muk. getting stuck isnt so bad.. i mean if your alone yeah but with other people its really fun.
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Unread 10-07-2009, 08:53 AM   #10
littlehoov
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Just get an inexpensive 12v tire inflator and you wont have to worry about driving on the highway with underinflated tires. Even the little tiny ones work well enough, theyre just slower.
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Unread 10-07-2009, 05:50 PM   #11
jpg0511
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Just put in am on board air system. Air down on the trail and air up when your done.
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Unread 10-07-2009, 06:42 PM   #12
MrJCRod
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Quote:
Originally Posted by chevelle4321 View Post
And you probably have not been in some loose sand lol or like digging / getting pulled out.


I went down to like 10psi on my 33's last time I was @ Pismo.
I'm running 33's on 15x8's also and am curious to see what psi you run on the street...
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Unread 10-07-2009, 07:14 PM   #13
RoyalXJ
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Originally Posted by jpg0511 View Post
Just put in am on board air system. Air down on the trail and air up when your done.
easier said then done. shi*t is pricey
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Unread 10-07-2009, 08:09 PM   #14
XJoutlaw
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easier said then done. shi*t is pricey

Exactly why I haven't done it I know bout it and I am not new to off roading or cars but I am broke.
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Unread 10-07-2009, 08:31 PM   #15
leftlanetruckin
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No sand, and a little larger tire....
street: 24 front, 22 rear.
wheeling: 10 front, 8 rear.
No beadlocks and no problems.
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