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.
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.
Just put in am on board air system. Air down on the trail and air up when your done.
92 XJ 6 1/2 RC lift plus 2in BB, 35x12.5 Mud Rovers m/ts Aussie front D30 and Powertrax locker C8.25 rear, Rusty HD steering, RC control arm drop brackets, Nates rear bumper, HD SYE, YJ brake lines, Transfer skid plate, Nates slim line front bumper, Smittybilt XRC-8 winch, converted A/C to onboard air, Rino lined Floor boards
06 TJ stock gone
08 JK Rubicon 3in Zone lift, 35x12.5x17KM2s 1.5 wheel spacers, Super Chips programmer
No sand, and a little larger tire....
street: 24 front, 22 rear.
wheeling: 10 front, 8 rear.
No beadlocks and no problems.
1998 XJ on 37's.JK Rubi axles with chromo shafts and ctm's, 4:1 transfer case, etc etc etc.
2003 Range Rover HSE, 4.4 Quad Cam.
1998 Range Rover with a 6.0 LSx
1994 YJ, 4.3/700R4/OME SOA, etc
Western Star 4900EX 4 axle.
4.3/700r4/new frame buildup (YJ).... http://www.jeepforum.com/forum/f12/swap-offically-underway-324622/