Just remember that if you're factually wrong, it's not an opinion anymore. You're just wrong. Opinions are for things that can't be supported directly with facts. Backspace is measured from the outside lip of the rim to the wheel mounting surface. That's a fact, that IS the definition.
The fact that your wheels have fit in the past is pretty much just dumb luck, and has more to do with the size of the wheel combination you used and the extra space you obviously had than your understanding of backspace, because you were wrong.
No problem! Glad I could help! :D
