Tiers du Cylindre is a named European roulette sector bet that covers 12 numbers with six equal split bets. The standard six-unit package is placed on 5/8, 10/11, 13/16, 23/24, 27/30, and 33/36. Those pairs look scattered on the rectangular number layout, but together they cover one continuous arc of a single-zero European wheel opposite the main zero sector.
The term is commonly shortened to Tiers. The French wording is traditionally understood as “third of the cylinder.” The name is a wheel-location label, not a promise that the wager covers exactly one-third of all possible results. Twelve pockets out of a 37-pocket single-zero wheel is about 32.43%.
Wheel order explains a bet that looks random on the layout
On the European wheel, the Tiers sequence is:
27, 13, 36, 11, 30, 8, 23, 10, 5, 24, 16, 33
On the felt, 5 and 8 are near one another, 10 and 11 are near one another, and so on. The six split placements are therefore easy for a dealer to construct even though the twelve covered numbers are not one rectangular block. On the wheel itself, the coverage forms a sector.
This difference between wheel order and layout order is the reason named European bets are often shown on a racetrack layout. A racetrack diagram represents the circular order of the pockets. The normal rectangular grid is designed for inside and outside bet placement, not for visualizing wheel sectors.
The standard package is six specific splits
| Component | Split | Numbers covered |
|---|---|---|
| 1 | 5/8 | 5 and 8 |
| 2 | 10/11 | 10 and 11 |
| 3 | 13/16 | 13 and 16 |
| 4 | 23/24 | 23 and 24 |
| 5 | 27/30 | 27 and 30 |
| 6 | 33/36 | 33 and 36 |
There is no overlap between the six components. Each of the twelve Tiers numbers belongs to exactly one split. If a covered number wins, one split wins and the other five component bets lose.
This construction also explains the price. A player asking for one unit of Tiers is normally asking for one unit on each split, so the total stake is six units:
\text{Tiers package cost}=6\times\text{unit size}A $5 unit creates a $30 total wager. A $25 unit creates a $150 total wager. When a terminal offers a one-touch Tiers button, check whether the displayed amount means the unit per component or the total package. Interface conventions can differ.
A hit pays one split while five components lose
A standard roulette split pays 17 to 1. If one unit is placed on each of the six Tiers splits and a covered number wins, the winning component returns 18 units including its stake. The other five units are lost.
| Spin result | Total returned | Net result on a six-unit package |
|---|---|---|
| Any of the 12 Tiers numbers | 18 units | +12 units |
| Any of the other 25 pockets | 0 | −6 units |
At a $5 unit, a covered number therefore returns $90. Because the player originally staked $30, the net profit is $60. An uncovered number loses the full $30.
Calling Tiers a “12-number bet” can hide this payout structure. It does cover twelve numbers, but it does so through six split bets rather than through a single 12-number outside wager.
The probability and edge come from the six-split construction
On a fair single-zero wheel there are 37 possible pockets. Standard Tiers covers 12 of them:
P(\text{Tiers hit})=\frac{12}{37}\approx32.43\%The other 25 pockets lose the package:
P(\text{Tiers miss})=\frac{25}{37}\approx67.57\%Using the +12-unit net result for a hit and the −6-unit result for a miss:
EV=\frac{12}{37}(12)+\frac{25}{37}(-6)=-\frac{6}{37}The expected loss is therefore 6/37 of one unit per six-unit package, or about 0.1622 unit. Divide that by the six units wagered and the expected loss rate is about 2.70%, the normal single-zero edge on correctly paid split bets.
The named sector does not create a lower house edge merely because it bundles several placements. It reorganizes the coverage and the hit pattern. If a table changes the payout, adds a promotion, or uses a different wheel or package, the calculation must be redone from the actual rules.
Tiers is not the second dozen
A common beginner error is to hear “third of the wheel” and assume Tiers means one of the three numbered dozens. It does not. The second dozen covers 13 through 24 on the rectangular layout. Tiers covers twelve numbers selected by their location on the wheel: 5, 8, 10, 11, 13, 16, 23, 24, 27, 30, 33, and 36.
The two wagers therefore have different number sets and different payout structures. A dozen is one 12-number outside bet that normally pays 2 to 1. Tiers is six split bets. Both can cover twelve numbers while behaving very differently on a winning spin.
Voisins, Tiers, and Orphelins use different wheel sectors and chip patterns
Tiers is one of the best-known named European sector wagers. Two others are Voisins du Zéro and Orphelins. They should not be compared simply by counting how many numbers they cover because the packages use different combinations of straight-up bets, splits, streets, and corners.
| Sector bet | Typical numbers covered | Standard package size |
|---|---|---|
| Voisins du Zéro | 17 | 9 units |
| Tiers du Cylindre | 12 | 6 units |
| Orphelins | 8 | 5 units |
Tiers is mechanically simple because all six components are equal split bets. Voisins uses mixed placements and includes a doubled stake on one component in the traditional package. Orphelins covers two separated wheel segments rather than one continuous arc.
Live-table procedure can matter as much as knowing the six pairs
Not every roulette table accepts announced or call bets in the same way. At a table that does, the player should state the instruction early enough for the dealer to confirm and place all components before betting closes. If the table uses self-service chips or an electronic terminal, the interface should show the twelve highlighted numbers and the total stake.
The safest practical habit is to verify the placement before the result is known. If one split is missing, the wager is not standard Tiers. If a chip sits on the wrong line, it covers different numbers. A dispute raised after the winning number has landed is much harder to resolve than a correction made while betting is still open.
For the underlying component payout, the Nevada Gaming Control Board’s current Roulette Rules of Play list the ordinary two-number split at 17 to 1. The named Tiers package is a European-sector convention built from six such splits; local table rules still control whether and how the package may be called.
Why the same twelve numbers can be bet in a different shape
A player could put one straight-up chip on each Tiers number instead of using the six splits. That would still cover the same twelve pockets, but it would not be the same wager distribution. A straight-up hit would produce a larger payoff on one component, while the total stake would also double from six units to twelve units.
If all component payouts are standard and the wheel is fair, the house-edge percentage remains the normal single-zero roulette edge. What changes is the stake size, frequency and size of wins, and bankroll swing pattern. This is a useful example of why coverage, payoff shape, and house edge are different concepts.
What the term does and does not tell you
Tiers du Cylindre tells you the intended wheel sector and the traditional six-split construction. It does not predict the next spin, identify a hot part of the wheel, or create an advantage because several adjacent wheel pockets are covered. Each new spin is resolved under the roulette game’s actual random process and table rules.
For terminology around the display used to select sector bets, see racetrack bet and neighbor bet. For the broader game context, continue to European roulette and inside bet.