Originally Posted by argosy20
Okay, to get more technical, offset is when the center is outward from zero, inset is when it is when it is inward from zero. Inset and offset sound better (and more technical) than backspace and frontspace.
If you own a later-model Ford van or pickup, most of the factory wheels actually have the inset stamped on them, it would say "inset10" or a similar number.
Lets try this again.
Those terms are not correct. Offset is not the opposite of Inset. The terms are 'Outset' and 'Inset', corresponding to 'Negative Offset' and Positive Offset', respectively.
Most wheel sellers use the positive and negative terminology, so that is what I would use. There is also some confusion, in that Ford also uses the 'inset' terminology when refering to bolt sizes and bolt insets.
Also, Inset and Backspace are different measurements, not interchangeable.