The max rating on my tires is 75, so even at 45 I am no where near the max. The stock recommended pressure for the Commander is 36 on the stock tires. These tires (Duratrac) recommend a normal pressure of 40 for the Commander. On the street, I run all my tires a little over the recommended pressures as my personal preference for driveability, and because I often do have a full load in the vehicle.