Shimano's new Dura Ace BB-9000 bottom bracket is nothing short of the premium quality we've come to expect from the Dura Ace line. For this revision, Shimano decreased the size of the bearings, resulting in significant weight savings over the 7900 generation. The BB-9000 also features a new seal design that boasts a 50% reduction in drag and ensures longer bearing life. Your pro-level build demands little short of perfection. Dura Ace offers the assurance and peace-of-mind that even the smallest details are meticulously dialed.
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