The wheel in American Roulette has a double zero, unlike French Roulette with a single zero only. The distribution of numbers on the wheel is completely different, since the zeros are placed against each other on the opposite sides. The colors of the numbers are the same.
You can take advantage of the voisins below if you would like to cover specific space of the Roulette wheel. It is not very probable, but this bet may have a justification if you feel that there are mechanical disproportions of the wheel. The ball can tend to end up in some parts of the wheel more frequently.
Figure – American Roulette Voisins