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Dimension: Outer diameter: 1.14 inch/29 mm; Inner diameter: 0.7 inch/18 mm; Ball diameter: 1/4 inch/6.35 mm Function: This ball bearing inlaid in the retainer design, it is a bicycle parts. Used for replacing the bicycle crank bearing. Application: The ball bearing is used for mountain bikes, road bikes. This crank bearing with 9 balls, which is fit for head parts with an inner diameter of 19mm. Material: Made of metal, high strength and long-lasting, solid and durable for you to use. Note: Please confirm the size matches your bicycle bearing frame before purchasing.