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The BBT-9 is for Shimano's Hollowtech II two-piece crank systems.
The big end has 16 notches to fit the external bottombracket bearing cartridges.
The small end has 8 notches to fit the splines of the adjusting bolt in the left arm.
Also fits External Bearing systems from Campagnolo, Race Face®, FSA®, SRAM®, Truvativ®, Chris King® & Phil Wood®.
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