The main reason for 37's is because that is the tire i have always wanted to run. The original plan was to build a 44 front and be done with it. I am also going to be graduating within 2 years and the jeep will not be driven everyday (44 front will be built then). Also when i am driving down the interstate my rpm's are close to 3000, which is a little high for me so i think the 37's will be about perfect. Lastly, I just want them ;D and with how low my jeep sits, it will give me that extra inch of clearance i need and stop the belly and 8.8 from dragging everywhere.