Perseverance makes a driver to the winning driver - 11-speed drive system of the latest generation. For the new Dura Ace 9000 series Shimano has evolved each system component, used to create one of the most innovative component group sets of all time. Carbon pulley plate Redesigned rear system with new spring mechanism Redesigned lighter, shorter and more equal shifting operation Cassette compatibility: 11 speed Carbon pulley plate Wide link design to reduce shifting deflection and increases rigidity giving precise shifting over an extended time period Max front difference 16T Max rear sproket: 28T Total capacity: 33T Weight: 158g
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