wheel design can make or break it.I'm still not sure what you mean by "40mm inside" but this is what I mean: The first is 0, its in the middle of the rim, simple. The next is negative, the hub mounting surface is beyond the center line of the rim. The last is what I am referring to. Lets say that's a +40 which moves that mounting surface towards the outside of the rim. What several people I have spoken to from several different companies have said is that on this rim because the +40 gives the backspacing of 7.07 the back of the rim face will hit the brakes.
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my wheel is a 19x9.5 +40 and clears the akebobo.
dont look at backspacing.
the wheel either fits or doesnt.
if the face is concave, it can still knick the caliper.