Auto Parts: wheels, hub flange, imaginary lines

Question
how do i find the wheel offset on the rims i have?

Answer
The wheel offset is the distance between the hub flange and the exact centerline of the wheel. You'll need to take a reading from TWO imaginary lines at the locations above. I can't add images or diagrams with this response or I would to make it easier to understand. If you need additional help, please include an email address with a follow-up question.
Thanks for the question, I hope this information helps you.
Kb