Eturatas Shimano GRX FC-RX600 30T

Front chainring type: DoubleChainring 30T (for 46-30T)For 10-speed rear derailleurCOMPATIBLE MODEL: FC-RX600-11, FC-RX600-10 (may be compatible with other models with same BCD and speed group)Gear arms: 4B.C.D. (Bolt Circle Diameter): 110 mm