The European wheel - also known as the Single Zero roulette or sometimes French Roulette is very similar to the American wheel.
The greatest difference between the European and the American wheel is the fact that European wheel only has a single zero - whereas American wheel has a single zero and a double zero.
The European table is more beautiful in symmetry while the American table is more practical during play because the red/black and odd/even are placed right next to each other, and the first18/last18 betting spots are placed right next to the single numbers.
Thanks to the single zero the European roulette players have better odds than the American roulette players.
American roulette wheel consists of 38 numbered slots: numbers 1 to 36, a zero, and a double zero. The betting layout consists of every individual number as well as a host of "outside" or combinations of numbers. After the players make their bets the dealer spins the wheel and a ball and after several seconds the ball will land in one of the numbered slots.

The wheel is unbalanced.
Of course there always exists a chance that the wheel is not balanced well. That’s why there are unfair gamblers who use it if they notice that the wheel is unbalanced. The truth is the unbalanced roulette wheel no longer exists. Casinos, too, have heard the story of Joseph Jaggers and are constantly monitoring their wheels. The casino staff examine the wheel every time before gamblers begin to play. If the casinos discover an unbalanced wheel, they immediately recalibrate it.
2. Most gamblers believe that with every new spin the chances of the ball landing in the number that has not been hit yet become much higher.
It is a mistake. The chances of hitting any number is 38:1. If the ball hasn’t landed in this very number for a long period of time it doesn’t mean that it is more likely to do it in a short while. Roulette is a pure game of chance. With every spin the chances of hitting any number are 38:1.