You're talking to the wrong guy, I
cannot stand the look of black wheels, I think they're the tackiest looking thing ever. This is why the 20s are not even a consideration for me (of course, the boat-anchor weight is a deterrent as well). But since you replied to me, I'll say this: don't do it!
I really don't get this craze with black wheels, what does it matter what they look like since you see such little detail. To me they all look cheap, like they're plastidipped in shoe polish. Well, until you hit your first curb and you break the plastidip layer and it looks even more terrible