Biased Wheel

A biased wheel is a roulette wheel with physical imperfections that cause certain numbers to hit more frequently than statistical expectation. Manufacturing defects, wear and tear, or improper leveling can create biases that a patient observer can detect and exploit.

Historical examples of biased wheel exploitation are legendary. In the 1870s, Joseph Jagger won the equivalent of $6 million by identifying a biased wheel at Monte Carlo. In the 1990s, Gonzalo García-Pelayo and his family used computer analysis of thousands of spins to find biased wheels in Madrid casinos, winning over $1.5 million.

Modern casinos regularly test and replace wheels to prevent exploitable biases. Roulette wheels are precision instruments that cost thousands of dollars, and casinos use electronic monitoring to track results and identify any statistical anomalies. While theoretically possible, finding and exploiting a biased wheel in a modern casino is extremely unlikely.