n sand 3-4psi. On the mountain I try to keep it around 8.5 back and 9 front with Nates. when I ran the Knards I had to run 10 in back and 11 in front to correct auto steer (much thinner tire). On the 27tpi Nates I could run 7psi front and rear on Mountain trails with no problem. Those pressures are running tubeless. With tubes I can drop a half psi or so and still feel stable in the turns.