With wheels think about the human eye...
Put black wheels on a bright color like red or yellow and from a distance the human eye can't perceive the detail of the black wheel. the contrast is too much to overcome, especially when it is bright outside or there is good lighting. This makes the wheels look like black circles.
Put black on a dark car and your eye can see the detail of the wheels and all the depth and details.
Put bright wheels on a dark car and the wheels become the focus and you lose some of the car's detail...
Put bright wheels on a bright car and you can see the detail of everything.
That is it in a nutshell. It depends on how you want your car to look. There is no right and wrong with the way the car looks
Keep this general idea in mind when you see cars on the road and at shows and you'll see exactly what I'm trying to describe. Especially at distances where the whole car is in view Vs. being close up to it in order to focus on one thing.