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Shimano ES51 Splined Bottom Bracket
Large 22mm diameter hollow pipe billet spindle reduces weight, increases strength and rigidity.
Maintenance free sealed cartridge keeps out dirt, mud, water, and aloows bottom bracket to be installed quickly without adjustment.
Size : 68mm Shell 121mm Axle Length
Designed for Shimano Octalink Splined 8 Pin Cranks
English Threads (Standard MTB)