Shimano Dura-Ace FC-R9100 Inner Chainring

Inner chainring for the Shimano Dura-Ace FC-R9100 crankset — the 11-speed generation of Shimano's top-tier road groupset, the same parts the WorldTour peloton ran through the R9100 era. This is the smaller of the two rings, the one your chain lives on when the road tilts up; the matching R9100 outer ring and the newer 12-speed R9200 ring are separate parts. Sold as the specific tooth-count variant matching your crankset configuration; not a complete crankset.