This replacement bottom bracket is designed specifically for Shimano Octalink 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 cranksets. Key Features: - Large 22mm oversize BB spindle- English (BSA) thread 1.37x24- Drive: Octalink Splined- Shell: 73mm- Axel length: 113mm- Weight: 272g- Crank bolts are not included

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