Shimano Dura-Ace FC-R9100 Inner Chainring

Shimano inner / outer chainring for the named series crankset — the replacement tooth ring you swap when the teeth are worn down to the point where shifting gets rough or the chain starts slipping under load. Sold as the specific tooth-count variant matching your crankset configuration; not a complete crankset. Dura-Ace is Shimano's top-tier road groupset — the same parts the WorldTour peloton runs. Weight-optimised, finished to the tightest tolerances in the range. This is the Shimano Dura-Ace FC-R9100 Inner Chainring.