When spin outcomes are random, roulette is a a game with fixed odds. The American version has a built-in casino advantage of 5.26%. This wheel has a green 0 and a green 00 on the wheel, which gives the casino the fixed advantage of 5.26% for each bet placed. The European roulette wheel only has a green 0 which reduces the casino's advantage to 2.70%. European wheels can be found in the US also. Only play on wheels with one green 0. The best bet overall is on a single zero wheel where the casino uses the "En Prison" or "La Partrage" rules. This means on all even money bets (red/black, even/odd, etc.) if the ball lands on zero, only half of the wager is lost. This cuts the standard house advantage on a single zero wheel in half from 2.70% to 1.35%. This is the best overall bet in roulette.
The exception is when roulette physics is used to predict spin outcomes. An example is a roulette computer, which is an electronic device that measures the wheel and ball speed to predict the spin outcome. Often the accuracy increase is great enough to substantially improve the player's odds of winning. Because the odds and payouts in roulette are different things, and the payouts never change, the only way to consistently beat roulette is by increasing the accuracy of predictions. And this is what roulette computers do, although they are only legal in approximately half of casinos. But legal or not, they are always forbidden as per casino rules.
Any roulette strategy that produces a genuine edge for the player is called "advantage play". There are a variety of advantage play systems - not just roulette computers. But they do not work on every wheel.
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In roulette you can bet on color (red or black), even or odd, rows of numbers, groups of numbers, so straight up. Straight up means you bet on one number directly, the ball landing on the number you picked directly has the highest payout, with the lowest odds.
It is 13.2%
There are 38 numbers on a roulette wheel - 1 through 36 and 0 and 00. Therefore, you have a 1 in 38 chance of winning if you place your bet on a single number. Some casinos do not have the double zero. Therefore, your odds change to 1 in 37.
fld. or fd is probably your best bet
You best bet would probably be to use kilograms.