I know I know, this topic has beaten to death.
I just have one question. Is there a difference between 0 offset, -0 offset and +0 offset?
If so, can someone please explain. Images would also help.

Thanks

All the same. 0 offset is 0 offset.

That's all I needed to know.
And that is the more desirable offset for AE86s?
Thank You

offset depends completely on wheel width. You cant know the fitment of a wheel without knowing both.

and "desirable" is subjective and preference really..

So, a zero offset is located in the center of the wheel? A nine inch wheel with zero offset will have 4.5" backspacing, correct? A wheel with -15mm offset will push the wheel out roughly another 5/8 of an inch? I suck at math, this is why its taking me so long to figure this out, hah.
Offset and backspacing are the same thing, correct?

Gatcha on the "desirable" subject

Thanks

You mostly have it right. 9" wide 0 offset isn't exactly 4.5" backspacing. Google up an offset to backspace chart for what's up. Now if you have two wheels the same width, one 0 offset and other -15mm like you said, yes the -15 will stick out away from the car 15mm farther than 0 offset. If you had a third wheel that was +15, it would be set 15mm IN from the 0 offset wheel. There would be a 30mm difference between the -15 and +15.

Thanks Eric, I'll go Google that info now
Thanks again for the explanation.