The tire pressure should be lowered to gain better traction on dirt, sand, and even rocks when off-roading.
Low pressures can also prevent punctures on gravel or dirt roads when driving at medium speeds so that the tread conforms to the individual stones and sharp protrusions.
Lowering the air pressure in your tires (pounds per square inch or psi) is a good idea for off-road travel.
No matter if you are on sand, snow, dirt, rocks, or mud, you will have more traction when you tire down.
It would help if you aired up immediately after you deflate. You should not drive on paved roads with underinflated tires.
It is difficult to work in mud, especially if the soil is black. Use pressures of about 24 psi. – If you must have traction on rocky, slow terrain, you may want to increase the pressure to 24-28psi.
– In serious off-road situations, the additional suspension travel you gain by lowering your tire pressures will make articulation over rocks and uneven terrain much easier.