European roulette wheel diagram.

A European (and French) Roulette wheel consists of 37 slots, numbered from 0, 1 through 36.

Red and black numbers change.

In the arc to the right of the zero (numbers from 32 to 10) there are nine black numbers that are small (2, 4, 6, 8, 10, 11, 13, 15, 17) and nine red numbers that are big (19, 21, 23, 25, 27, 30, 32, 34, 36).

To the left of the zero (numbers 26 to 5) there are nine black numbers (20, 22, 24, 26, 28, 29, 31, 33, 35) and nine red numbers (1, 3, 5, 7, 9, 12, 14, 16, 18).

Numbers face the inside of the roulette wheels.

There are three standard arcs which are covered by call bets (announces):

“Voisins du Zero” arc

Consists of twelve continuous numbers: 22, 18, 29, 7, 28, 12, 35, 3, 26, 0, 32, 15, 19, 4, 21, 2, 25.

The “Tier du Cylindre” arc

Consists of the following numbers: 27, 13, 36, 11, 30, 8, 23, 10, 5, 24, 16, 33.

The “Orphans” and “Orphelins” arc

The “Orphans” and “Orphelins” contains eight numbers: 17, 34, 6, 1, 20, 14, 31, 9.

American roulette wheel diagram

An American Roulette wheel contains 38 slots. The difference between European and American roulette is that the latter has a double zero slot, all other slots are the same – zero and numbers from 1 to 36.

In American Roulette the numbers on the roulette wheels are ordered in such a way as to achieve certain mathematical balance between red and black, high and low and even and odd:

Red and black numbers change each other.

Usually two odd numbers are in turns with two even numbers.

All red numbers are opposite black numbers.

Every odd number is opposite the next higher even number.

Zero and double zero are both green slots, while the remaining 36 are split between red and black.

Numbers face the outside of the wheel.

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