In roulette, a tier refers to a specific betting option on the European or French roulette wheel. It covers numbers that are opposite to the Voisins du Zero bet, typically including 12 numbers: 27, 13, 36, 11, 30, 8, 23, 10, 5, 24, 16, and 33. This bet is placed as a single chip wager and pays out if the ball lands on any of these numbers. 
Tier bets are popular among players who use strategies based on wheel sections, as they cover a third of the wheel\“s numbers excluding zero. It\“s important to note that this bet is not available in American roulette due to the different wheel layout. |
