It is well known among certain circles that roulette wheels can often exhibit bias. This basically means wheels that are showing numbers coming more than are statistically normal. On a 37 number wheel then each number will arrive once every 37 spins. Over a long enough series of trials then you will tend to see this distribution or near as damn it. But there are often reasons where certain wheels are showing numbers that are coming more often than what they should be!
This can be to do with temperature differences or the main reason is usually to do with faults that are present inside the actual wheel itself. This could be a looseness in the actual frets or canoes that are absorbing energy as the ball lands and thus warping the outcome of the event.
If this leads to so much as a certain number coming one spin in every 36 spins instead of one in every thirty seven spins then this would allow the player to be at evens with the house. It is easy to see then that if a player was seeing any individual number arrive at a rate of once every thirty fives spins or greater then this would not only reveal a bias but also a bias that was large enough to give the player enough of an edge to make a theoretical profit.
The main problem comes from detecting a true bias and this means that seeing false patterns is all too real with detecting wheel bias. I would ascertain though that any number that was coming more than it should over say 200 spins would merit further investigation. If that continued to as much as 500 spins then it would have to then be taken very seriously and after 1000 spins then wagering money could seriously be considered.
