Shimano didn't forget about the Bottom Bracket when redesigning their Dura-Ace group. Compared to its predecessor, the BB-9000 manages to simultaneously shave weight and boost efficiency, all while maintaining industry leading weather resistance and durability. Wide-stance, outboard bearing system with improved seal design.
English thread only (68mm shell 1.37 in x 24 TPI)
The Dura-Ace BB-9000 Bottom Bracket is specifically designed for the Dura-Ace FC-9000 Crankset
The external cups have been reworked using a slightly smaller diameter, allowing Shimano to shave a few grams off
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