16psi in the front and 18 psi in the rear ,if you run the same psi in the front the wheel has a dendancy to tuck under and have a lot less traction ,depending on where you ride on loamy soft soil yu can run slightly lower pressures providing its not at all rocky ,in tuff rock infested **** you'd wanna run slightly higher pressures.Always make sure that your valve nut is tight in any conditions