Shimano ES51 Splined Bottom Bracket - 68mm

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An 8-spline joint between the bottom bracket axle and crank results in a more rigid, non-loosening crank assembly. Fits Shimano FC-M752, FC-751, FC-M571, FC-M510-8, FC-M440-8 cranks. Maintenance-free sealed cartridge keeps out dirt, mud, water and also allows bottom bracket to be installed quickly without adjustment. Replacement 8-spline bottom bracket for Shimano® Octalink splined hollow tech cranks.