Interestingly, many players try to formulate ways to gain an advantage in roulette. This includes memorizing the numbers on the roulette wheel. Though, some will even attempt to figure out the size of the casino roulette wheel.The standard size of a roulette wheel in modern casinos is 32 inches or 80 centimeters. Knowing the size of the roulette wheel will not increase your chances of winning big. Roulette is a game of chance and contributes to more losses than any other game in the casino.