Shimano Ultegra FC-R8100 Ultegra 12 speed outer chainring, 50T-NK for 50/34T

The Shimano Ultegra FC-R8100 12 speed chainrings are the perfect replacement for worn or damaged chainrings HOLLOWGLIDE, hollow outer chainring technology, giving vast improvements in rigidity and increased weight savings, whilst also removing outer chainring flex, hugely improving shift performance making it precise even under high load The teeth have been developed to work only in conjunction with 12-speed chains for improved contact providing more efficiency and improved power transfer Genuine Shimano replacement chainrings for the FC-R8100 & FC-R8100-P cranksets available in 52T, 50T, 46T (Outer ring), 36 T, 34 T (Inner ring) Shimano part numbers: 52T-NH - Y0NG98020, matches 36T-NH - Y0NG36000, 50T-NK - Y0NG98010, matches 34T - Y0NG34000, 46T-NH - Y0MZ98110, matches 36T-NH - Y0NG36000 Compatible chain Shimano HG 12-speed