Standard air pressure for on-road driving varies between 30 - 38 PSI depending on the size of tires and weight of vehicle. When readying for off-road trails and obstacles, it’s best to reduce the vehicle’s tire pressure to 12 to 20 PSI for wheels without bead locks, and 7 to 10 PSI for wheels with bead locks. The reason is so the tires can better conform to trail terrain for increased traction over foliage, rock, and mud. DriveLine published a comprehensive how-to article explaining the logic and tools needed to ensure it’s done correctly. Check it out here:

BEST TIRE PRESSURE FOR OFF-ROADING?

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