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    If we compared ceramic to steel ball bearings, ceramic ball bearings offer a superior corrosion resistance, greater dimensional stability, lower density, higher heat resistance. All this translates into a more efficient material for bottom brackets.
    Ceramic balls are 60% lighter than steel balls. This results not only in a lighter bearing overall, but also creates less centrifugal force inside the bearing, improving its performance.
    Smoothness and roundness. Ceramic balls have a smoother finish than steel. That affects directly in the roundness with grades up to 25/1,000,000 of an inch of accuracy. This reduces vibrations and a uniform contact between ball and ball surface will improve lifespan of the bearing.
    High rigidity. The compressive strength of ceramic materials is about 5 to 7 times that of steel. 
    Corrosion resistance. Bottom bracket bearings are very exposed parts from moisture and dirt. The chemically nature of ceramic balls bearings makes them much more resistant to corrosion than steel.