The best roulette exploits depend on the older "deep pocket" wheels, which is why they are less common these days.
A single zero deep pocket wheel has the most exposure of any wheel around.
You won't find very many deep pocket wheels on the strip. They are mostly found in lower limit locations.
I don't have a list handy, but you want the ball to be sort of "slurped" right into the pocket instead of bouncing around if you're going to take advantage of any bias.
I have only heard of such devices, but a device that lets you press a button each time an event occurs can give you feedback on bias and how to exploit it in general.
You press a button when a specific number passes a specific point, and then again on the next spin. Then each time the ball passes the same point another button is pressed.
Some feedback is given to tell you what to bet to exploit the bias of the state of the ball and spinning wheel.
Such an electronic device would have input and output in your shoes, for example. Poking up on your toes for output and pressing your big toes down for input.
Disclosure/disclaimer: I am not well researched on any of this stuff. This is just basic theory from what I understand of what might possibly be achievable. I have never spoken with anyone who has such a device or who has even seen such a device. I do not know if such exploitation is truly possible or not or if anyone has ever successfully exploited the roulette wheel before. IE: all of the above is absolute guesswork from someone who really doesn't know what they are talking about!!! LOL. Enough disclaimer? OK... Anyway have fun and don't get in trouble or put in jail, ok?
First you need to identify a certain type of biased wheel before the Wheel "clocking" devices will work. these devices can now be made as apps. I was recently sent on a course run by a former casino cheat on new tech being used. Which means that anything he showed us is already outdated. It was interesting but shows that these devices can work.
I can assure you that if I found a bet that paid 2:1 on an event that occurred 50% of the time, and I could make that bet over and over and over again indefinitely, you would not find me on this list whining about variance. If you were nice to me, though, I might invite you to my private island.
What's stopping you? Go stare at a roulette wheel and figure out when the ball is going to land in a 2nd dozen zone and bet only then. I will do you one better. Only bet 5 numbers on the side you think it will land. I just reduced your bet size by more than half! Can't wait to see the island!
I was just replying to the comment that, if you could get paid 2:1 on a bet that you could correctly predict 50% of the time, the variance would kill you. That is an absurd notion. Of course, I never claimed to be able to make such a prediction on such a bet.
Even if you knew when the ball was going to land in the zone with the 2nd dozen numbers, you would expect a 50% chance to win with a 2:1 payout.
I don't think MarieBicurie understands that 2:1 payout means 2 to 1; and that a 50% chance of winning given a 2 to 1 payout is a good bet as pointed out by AxiomOfChoice. The variance of said wager would be irrelevant, which is something AxiomOfChoice also pointed out.