Shimano Dura-Ace SM-BB9000 Bottom Bracket - Road Bike Shop

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Shimano Dura-Ace SM-BB9000 Bottom Bracket
Price: $34.99
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If the History of Bottom Brackets 101 wasn't taught in your school, you probably don't know that Shimano was one of the first to adopt the external bottom bracket. Its Dura-Ace SM-BB9000 Bottom Bracket sits at the top of the line in terms of being serviceable, reliable, and exceptionally durable. The SM-BB9000 mates with the new Dura-Ace groupset and uses smaller bearings than the previous 7900 version. This results in a decrease in friction, making them roll even smoother. The new seals that have been incorporated result in a 50% reduction in drag without decreasing the protection levels of the bearings.