Shimano CS-R8101 Ultegra 12-Speed Cassette

Shimano cassette for the named series, 12-speed configuration — the rear cog stack that defines your gearing range. Shimano's HG / HG+ tooth profiles give the smooth, precise shifting that's the brand's reputation; matched pairing with the same-series chain and derailleur is what delivers the in-spec performance. Ultegra is Shimano's second-tier road groupset — approximately 95% of Dura-Ace performance at a materially lower price and weight cost. Standard on high-end consumer road bikes. This is the Shimano CS-R8101 Ultegra 12-Speed Cassette.