The Shimano FC-3550 Sora 9 speed chainrings are the perfect replacement for worn or damaged chainrings
Shimano's class leading chainrings offer the optimum balance of light weight and rigidity for precise shifts even under high load
The teeth have been developed to work only in conjunction with 9-speed HG chains for improved contact providing more efficiency and improved power transfer
Genuine Shimano replacement chainrings for the FC-3550 Sora cranksets available in 46T (Outer ring), 34T (Inner ring) 
Shimano part numbers: 46T-F - Y1NB98050, matches 34T - Y1NB34000
Compatible chain Shimano HG 9-speed