Keep in mind the relationship of the tire center of tread in relation to the center of your wheel bearing. This is usually not mentioned in the same post as using wheel spacers/adapters. When your tire center moves outward, you change your geometry and bearing load. Try to get a happy medium and achieve good handling.
Jim
True mathmatics jim, but I'd like to comment on this matter.
So my car came with wheels that are severely positive in offset. If I consider the original geometry associated with them to be the engineer's idea of perfection then I must automatically conceed that that ANY changes to size and offset will result in an inferior design, and therefore an inferior functionality.
I have added larger rims and larger tires, in addition I have 1"-2" spacers all around. Should I consider this more a problem than the fact that I sliced my MR2 in half then rewelded it together resulting in a sever change of geometry? Even when you use a Fiero and change the Steering Column, the Engine, Transmission, Axels, Brake System, Weight of the car, shape of the Cradle, Etc. is there a happy medium?
The idea of a happy medium is just NOT REALISTIC - I know there are EXTREMES like having 22" rims on a Fiero and 4" Spacers... and yes that is just rediculous, but what we end up doing is the barely possible safety barrier without thinking "is this a medium of two exterems"