another rims question

I am curious too what the max offset rim that can be used is.

Keep in mind the other factor to not forget is backspacing which in my opinion is more important because that is the actual number that will make a rim mount too far inward. Backspacing is the amount of rim from the hub it mounts to to its edge and offset is how much off-center a rim is on a vertical axis and can be responsible for fender rub on spring compression.

Which brings me to a question of my own, anyone know the maximum amount of backspacing before the tires/rim starts interfering with suspension components?