Shimano Ultegra FC-R8100 12-Speed Chainring High Quality Chainring Shimano Ultegra FC-R8100 chainrings are constructed with high-quality aluminum and are compatible with FC-R8100 and FC-8100-P 2x12-speed cranksets. It has an asymmetric 110 BCD and has Hollowglide technology that provides high rigidity and cuts down on weight while maintaining strength. This offers better power transfer and quicker, more precise front shifting. Features Aluminum with anodized finish and carbon fiber reinforced plastic for extreme durability and light weight Hollowglide technology provides high rigidity and cuts down on weight while maintaining strength Offers better power transfer and quicker, more precise front shifting Compatible with HG 12-speed chains SPECIFICATIONSDrive Train Speed12-Speed Tooth Count50T, 52TBolt Center Diameter Asymmetric 110 BCDMaterial Aluminum Intended Use Road Weight N/A | Shimano | Ultegra Fc-R8100 12-Speed Chainring 52T Asymmetric 110 Bcd | Black | Nh | Aluminum