Some types of bias only happen when a specific combination or rotor and wheel base (main part) are used together. In facts it’s from a combination of things. Roulette wheel bias is not always caused by the rotor. And one of the measures casinos take to prevent it is by regularly changing rotors between wheels. This is because rotor sometimes develop defects from wear and tear, and the defects cause some numbers to spin more than others. The rotor is designed to be interchangeable between wheels, at least when they are from the same manufacturer. The part with the pockets that spins is called the “rotor”. In fact you could change the pockets of any wheel by changing the rotor, then you’ll have changed the wheel type. Is there any difference in the wheel design?īesides the visible difference in the pockets, NO. Specifically the house edge on the European wheel is -2.7%, and 5.26% on the American wheel.

This means you have a better change of profiting on a single zero European wheel. The payouts are all the same, but because of the extra pocket, the American wheel has a higher house edge. It’s just there is an extra pocket on the American wheel (the double zero), and the sequence of numbers is different.

If you look at the diagrams, that’s really the only difference. The Differences Between American and European Wheels Below it’s in text form for use in software like system testers: You can see in the pictures above that the sequence of numbers is different for each wheel. You can use these images however you want, provided the copyright notice is not removed. See below for a diagram (image / picture) of each roulette wheel layout, including European and American roulette wheels.

Pic of european roulette wheel