TOKEN SHURIKEN Big Pulley Kit Black TK1729S-TBT [ERD1729S-TBT-BKTK]

Compatible RD: Shimano R9100, R9150(Di2), R8000, R8050(Di2) Pulley: Upper 12T, lower 19T (CNC AL7075 with PVD coating) Bearing:TBT Capacity: 16T (chainring) + 23T (cassette) Low side compatible MAX gear: 34T Cannot be installed on Long Cage (GS), Ultegra RX, and R7000 series rear derailleurs.