There are many variables involved in calculating ground contact pressure, including vehicle weight, load, attitude, and contact patch size, which depends on tire size, tire stiffness, tire pressure, soil condition, and others. We estimate the ground contact pressure of a Rokon with a rider weighing 200 lbs. is 4 psi. On foot, a person weighing 200 lbs. would have a ground contact pressure of 6 psi.