The following are some of the main pressures you can apply to different terrain types: If the road is sealed, the pressure should be between 32 and 40 psi. Gravel requires a minimum of 32-36 psi. Try deflating the tires between 15-25 psi in the sand if you lose traction. I would probably recommend a pressure of 24-28 psi if it is rocky and slow, but you want the traction. It's not easy to deal with mud, and if it's black soil, you are in for some interesting experiences. Set your pressure to 24 psi.