The main difference between European and American wheels is staring you right in the face as soon as you approach the American roulette table. There is one additional pocket with a **double-zero (00)** plus numbers 0 through 36. This makes for a total of 38 numbered segments on the wheel.

**The American wheel uses the following clockwise sequence for its numbers** – 00, 27, 10, 25, 29, 12, 8, 19, 31, 18, 6, 21, 33, 16, 4, 23, 35, 14, 2, 0, 28, 9, 26, 30, 11, 7, 20, 32, 17, 5, 22, 34, 15, 3, 24, 36, 13, 1.

There are **18 black pockets and 18 red ones**. Green color is used for the single-zero and the double-zero, which represent the house edge of the game (5.26%). Some American wheels use blue instead of green color for their zeros.

If you inspect the double-zero wheel up close, you are bound to notice certain regularities. The order of the numbers is, in fact, pseudo-random. Ironically, this pseudo-randomness aims at **ensuring completely arbitrary outcomes** and eliminating predictability.

The first regularity that strikes you is that an odd number is almost always directly facing each even number. Look at number 25 red, for instance. It is sitting on the opposite side of the wheel directly against 26 black. A similar pattern can be observed with the majority of the other even and odd numbers. The two green zeros appear to disrupt this pattern ever so slightly.

This brings us to the second pattern that concerns the color characteristics of the numbers. Of course, red and black always alternate on the wheel. It also makes sense that the color of the numbered pockets coincides with the color of the numbers spread over the betting layout. The interesting thing here is that **red numbers sit across black ones**, with very few exceptions. Similarly, the green single zero is placed directly across the double zero.

Opposite numbers are usually sequential in terms of value. Check the double-zero wheel and you will see 13 black is positioned across 14 red, 15 black sits against 16 red, 29 black faces 30 red, and so on.

Also, **odd and even numbers tend to appear in pairs** on the wheel. For example, 25 sits next to 29, 12 sits next to 8, 19 is placed next to 31, etcetera. A disruption of this pattern occurs only near the sectors with the zeros.

The double zero separates the pair of odd numbers 27 and 1. Respectively, you have odd 27 next to even 10 on the right of the 00 pocket. The single zero divides numbers 2 and 28, so you have even 28 next to odd 9 to the left of the 0 pocket.

One can discern a pattern when it comes to low (1-18) and high (19-36) numbers as well. The spread of the wheel appears to be such that pairs of low numbers alternate with pairs of high numbers.

View more...European casinos use single-zero wheels for their roulette tables. There are 37 pockets on the European wheel, with **numbers 1 to 36 plus the green single zero**. The absence of the double-zero pocket significantly decreases the house take of European tables.

What’s interesting is that when roulette was first introduced in Europe, the game played on a wheel with two zero sectors. It was not until the Blanc brothers opened their **Bad Homburg casino** that double-zero wheels were altogether ditched for single-zero ones.

Here you are fighting **twice as low house edge** which drops to the relatively tolerable 2.70%. Most European tables allow for the placement of section bets that cover certain segments of the wheel, such as Voisins du Zero, Tiers du Cylindre, Jeu Zero, and Orphelins. These are unavailable at double-zero tables because the numbers on their wheels are sequenced differently.

**The single-zero wheels in European roulette have the following clockwise sequence for their numbers** – 0, 32, 15, 19, 4, 21, 2, 25, 17, 34, 6, 27, 13, 36, 11, 30, 8, 23, 10, 5, 24, 16, 33, 1, 20, 14, 31, 9, 22, 18, 29, 7, 28, 12, 35, 3, 26.

The patterns in the sequence are **similar to those on double-zero wheels**. Most odd numbers are positioned almost directly against even ones although this regularity is disrupted in some places. The same goes for the numbers’ range.

An almost perfect balance is achieved with the alternation of high and low numbers. One place where this fails to happen is the section with **numbers 5 and 10**. These are both low but still sit next to each other on the wheel. A high number is placed on either side of the green zero, which is neither high nor low.

Another interesting pattern has to do with the colors of the even and odd numbers. Upon closer inspection, you may notice that odd numbers within the 1-10 range are red (1, 3, 5, 7, and 9) while **the even ones are black** (2, 4, 6, 8, 10).

It is the opposite for the next stretch that covers 11-18 where odd numbers are black (11, 13, 15, 17) and **the even ones are red** (12, 14, 16, 18). The pattern changes for the stretch with 19-28 – odd numbers are red and even numbers are black. A change occurs again for the last stretch of eight numbers from 29 to 36. The black pockets contain odd numbers (29, 31, 33, 35) and the red ones contain even numbers (30, 32, 34, 36).

View more...There are **two noticeable asymmetries** on single-zero wheels. If you slice the wheel in half starting from the zero pocket, you may notice one side features only low red and high black numbers while the other one has only high red and low black numbers.

The second asymmetry occurs in the sector that contains numbers 32, 0, 26, 3, 35, 12, 28, 7, and 29. This segment of the wheel **entirely lacks numbers 13 through 24** which comprise the second dozen on the table layout. If the speed of the ball decelerates so that it lingers in this sector, your chances of winning with a bet on the 2nd 12 decrease.

The patterns on European wheels are more difficult to detect when compared to those on their double-zero cousins. There is one less obvious difference between American and European wheels but it is purely cosmetic. **The numbers on single-zero wheels are facing inward**, i.e. toward the wheelhead’s center. These on some American wheels are facing outward, i.e. toward the rim of the wheel’s bowl.

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