Shimano XTR M9000 11-Speed FC-M9020 Chainring 22T-AR for 40-30-22T - Y1PW22000 For use with 32t (CK9017) and 40t (CK9018) chainrings Material: Aluminum Chainring BCD: 64 Shimano Asymmetric Defined Color: Silver Ring Position/TYPE: Inner