This document summarizes how Six Sigma was used to reduce rework and nonconformities at a Bridgestone tire manufacturing facility. The project addressed two specific nonconformities, A and B, that were occurring on the same product. Prior to the project, the rate of nonconformities was 3.2%. Through applying Six Sigma tools including define, measure, analyze, design and validate phases, the team identified key process inputs, conducted a design of experiments, and ultimately reduced nonconformity A to 0.4% and eliminated nonconformity B completely. The new specifications also reduced material costs by 5%.