Unless you have bead locks I'd say that is a tad low. 5-7psi is the norm. Plowing, you could get away with a bit less. Too little pressure and you may either roll the bead off the rim or spin the wheel on the bead.what yall running for pressure? Im running 26 inch zillas at 2 lbs right now. Im wondering if thats to low? Im running 2 lbs for plowing but should i add more for summer riding?