SHIMANO ULTEGRA - Bottom Bracket - Threaded - HOLLOWTECH II - 68/70 mm shell widthWith reliable SHIMANO bearings and seals, the SHIMANO ULTEGRA bottom bracket has a long service life.Key Features:HollowTech II integrated bottom bracket uses a wider bearing placement and larger axle diameter for increased stiffness and efficiencyHollowTech II integrated bottom bracket seal design has minimal bearing interface ensuring smooth rolling and increased durabilityUse TLFC37 or TLFC25 in conjunction with TLFC36 adaptor tool for installation and removalSpecifications:Shell Type: ExternalShell Width: 68mm (English) or 70mm (Italian)
Amazon14g lighter than SM-BB6700 Half the friction of SM-BB6700 Equal durability to the SM-BB6700
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