is an off-set something you put so your wheels are farer than what they should be? I'm not sure about what it is..anyway, I personnally have 17x7 wheels, but I don't think I have an off-set...
A 48 mm offset on a 7" rim will clear everything, but will look a little lame, being so far inboard. Also, it will affect scrub radius, thus impacting steering feel to some extent.