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This replacement bottom bracket is designed specifically for Shimano Octa-link splined hollow-tech cranks. For convenience it comes assembled and greased, all ready for installation.
8-Spline Interface: Oversize axle with 8-splines provides a more rigid interface between the crank arm and bottom bracket.
Fits Shimano FC-M751, FC-M571, FC-M510-8 and FC-M440-8 crank-sets.