Shimano GRX RS501 Bottom Bracket

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Shimano RS501 is a bottom bracket recommended for GRX cranks. Thanks to its small ball bearings, weight is saved. This bottom bracket also has an axle diameter of 24 mm (Hollowtech II), which has proven to be optimal in terms of stiffness and rotational efficiency. Designed for a perfect fit with Hollowtech II 24mm crank spindles Anodized aluminum cups are high strength and light weight Spindle Interface Type: Shimano Hollowtech II BB Shell Width: 68mm English Weight: 92g. Color: Silver Show more