not trying to piss on your fire mate, but i am quite sure savage will back me up on this, he dosn't have a set tyre pressure, beacuse of the wether or something:S, your tyres feel harder or softer on dif days, so savage just get on the edge of a step or rock or something and pushes on his tyre till it rims out, if it rims out easily then its too soft and vice versa. joE!