okay i googled it and so when you say -18 offset you are saying that it is negative 18mm from the center of the wheel. well im set on the BMF wheels and i want some sort of lip either 0 offset or a negative offset. i looked on there website and i saw a jeep with 17x9 M80s and it had a positive offset with a smaller lip. i thought it looked terrible. so im still thinking about what to do. thanks for all the research and explanation guys it has helped a ton.

since i have been on the computer all day trying to figure all of this out my girlfriend of 4 years has bee glaring at me asking what in the hell are you doing to keep you on the computer all day. i told her and tried to explain it and she gets it. she told me if you buy me a ring i will buy your lift rims and tires.

 

check out this website. should help you out.

https://www.rsracing.com/tech-wheel.html

 

Probably similar to the previous post but is extremely helpful.

http://www.rimsntires.com/rt_specs.jsp
This website gives you comparables to whatever sizes you want to specify. I learned alot from this. Good luck!