Just out of curiosity. How much air has someone put in there 589's? I have 27's and have about 8 psi in them right now. The max it says to go to on the tire is 7 psi, which gets your about 26-1/4 in height. I want all 27''s and i think around 12psi is where i would see that at. What would happen if i rode on these tires with 15 psi in them. I see that people with Mudzilla's and laws put up into the 20's.