Dura-Ace moves to the next generation. Tested in competition and taken to victory by pro riders in all conditions, including the 2012 Tour de France Team Sky. Cutting edge technology for the ultimate in control and confidence. Revolutionary new chainset design allows you to fit a standard double, or compact setup onto the same crankset. Key Features: Replacement inner chainring for FC-9000 chainset. Teeth: 39. Ideally paired with 53T-MD outer chainring. New 4-arm design for same stiffness with lighter weight. 11-speed compatible for use with new Dura-Ace 11-speed chain, cassette, shifters and derailleurs. Hollowglide chainrings give incredible rigidity, hugely improving shift performance to make it precise even under high load. Same bolt circle diameter for compact and traditional double chainsets means that the Dura-Ace FC-9000 crankarm fits all chainring sizes, allowing for unparalleled customisation.