Compatible with the below: Ultegra: RD-6770, RD-6700-A, RD-6700, RD-6600, RD-6500 Deore XT: RD-M772, RD-M771, RD-M770, RD-M761, RD-M760, RD-M751, RD-M750 Saint: RD-M810-A, RD-M810, RD-M806, RD-M805, RD-801, RD-M800, RD-C910, RD-T780.