need help figuring out new offset for wheels???

alright guys this is my first post on here. but i have a 92 explorer that is getting the rough country 4 inch lift put on. looking to put 33x12.5 tires on it. but i am trying to figure out the stock offset and what i would need to change it to in order to adjust for the size change. i have also been thinking about just getting some 2 inch spacers. i currently have 31x10.5 on wheels that have the stock offset. and they are close to rubbing things as is so i know i will need more space. and i figure if i can find out which is best. i am not even sure i can get that much of a change with wheel offset i may need spacers. i am sure some of you guys may be running this size tire. so any help you guys can give me will be greatly appreciated

 

[cybergasm]

well for the Tire size you are looking should get 15x8 with 3.75 backspace if you are looking at steel wheels

and don't even bother with the spacers that opens a whole 'nother can of worms you don't wanna deal with.