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Believe it or not the reason offsets are not given out is to keep other wheel manufacturers from getting free R&D on what works for a particular vehicle. We all want deep dish or concave wheels and in sizes that are usually larger in diameter and/or width than stock. So what works, or does not work? What is the offsets and backspacing that will allow the custom wheel to fit? To REALLY look good? If you are a wheel manufacture and do all the leg work and come up with the answers you don't want to "give it away" so to speak. Like mentioned above it becomes a "closely guarded secret". It is also why some wheels may look a little "deeper" or more concave than from one wheel manufacturer to another. Yes you can measure it, but who ever wants to know (the whoever is another wheel comapny they are worried about) then has to buy the wheel(s) to find out.
This same reasoning is behind why many manufacturers of coilovers and aftermarket springs will not list the lbs/in ratings of the springs they developed and sell.
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