Shimano, Dura Ace FC-R9100, 52T Chainring, MT, 11sp, BCD: 110, Aluminum, BlackThis Shimano outer chainring is designed to update or maintain the high performance Dura Ace FC R9100 11 speed crankset. Specifically engineered for a 52 36 tooth combination, it allows riders to optimize their gearing for a balance of high speed descending and efficient climbing. The 4 bolt design utilizes a 110mm asymmetric BCD to ensure a perfect fit and seamless integration with the R9100 crank arms. The chainring incorporates Shimano Hollowglide