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wow...offset is really easy to understand.
it's measured in correlation to the center of the wheel. 18x8 0 offset (4 inches on each side of center)
18x10 0offset (5 inches on each side of center)
add one inch to the face of 18x10 now equals 18x11. a zero offset will have 5.5 on each side of center. If the mounting point was zero offset at 18x10, adding one inch changed the location of where the center of thr rim is. Now you have to measure from center (0 offset) to the location of the mount (which was zero offset on a 18x10 now 18x11) in which 25mm equals about an inch, you should have a rough -12 offset (add one inch is half an inch on either side of center (zero offset).
offset is measure from center to the mounting position. Measure in mm. positive offset if mount is past the center (less lip, more back spacing) and negative is opposite (more lip, less backspacing).
I hope this helps ;D
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