Mirror-like rolling bearing raceways: why it happens, why it is dangerous, and how to stop it A rolling bearing raceway can be smooth and shiny from manufacturing, but it should not become a true mirror-like, lapped, chrome-looking track after service, especially when it is accompanied by black/brown lubricant, pitting, rough patches, cage wear, discoloration, or metal debris. … Continue reading Mirror-like rolling bearing raceways: why it happens, why it is dangerous, and how to stop it