Bottom bracket Shimano BB-ES51 "BB-ES51" Sealed cartridge bearing for MTB English 73mm width Fits Deore Octa-link crankarms Features Octa-link splined spindle ends Compatible with any splined Shimano crankset that uses a separate BB LX crank model FC-M572 and Deore crank model FC-M455 require the use of a 118mm spindle length Large 22mm diameter hollow spindle 262 grams 68/73mm