Shimano Dura Ace FC-R9100 Outer Chainring

Outer 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. The outer ring carries most of your riding time and wears first; when shifting gets rough or the chain slips under load, this is usually the ring that needs replacing. The matching R9100 inner 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.