hey guys! hoping you can help me out. I have a 2012 f150 ecoboost fx4 and i have purchased a 6" pro comp lift kit. i want to get the new rockstar II's (20 by 9's) and a 35 by 12.5 tire but i dont know what offset to go with. it really confuses me lol. i want to put some flares on as well and obviously would like my tires to be flush with the outside of the flares. i dont mind if they even stick out a little further, i just really wanna make sure they aren't inside of the flares.
thanks in advance for the help guys

 

Mine are 20x9 and the offset is -12. I have the big bushwhacker pocket flares and they are about even with them. Same size tires you are wanting and pro comp 6" lift. Also 2012 ecoscrew.

 

Here is a photo with the stock bumper.