The Shimano Tiagra FC-4550-S 9 speed chainrings are the perfect replacement for worn or damaged chainrings
The chainring teeth have been developed to work only in conjunction with Shimano HG 9-speed chains for improved contact providing more efficiency and improved power transfer
Genuine Shimano replacement chainrings for the FC-4550 cranksets available in 50T (Outer ring) only
Shimano part numbers: 50T-F - Y1HA98050
Compatible chain Shimano HG 9-speed