This Shimano chainring allows you to update your Dura-Ace FC-R9100 11-speed crankset with a chainring configuration to best fit your riding style.52 Tooth chainring is designed to be used as the outer chainring in a 52/36 tooth combinationIntegrates Shimano Hollowglide Technology: the high rigidity hollow structure cuts down on weight, yet maintains strength to provide better power transfer and quicker, more precise front shiftingFeatures a weight saving 4-bolt design with a BCD of 110 mmItem SpecificationsChainring BCD110 Shimano AsymmetricColorBlackDefined ColorBlackDrivetrain Speeds11Ring Position/TypeOuterTooth Count52 Shimano Dura-Ace R9100 11-Speed Chainring UPC: 689228907195