You can find all the best-brand replacement parts at Escapa, such as the Shimano RD-5800-GS Pulley Set
Shimano RD-5800 GS 11-tooth pulley set (Model 105), consisting of a tension pulley and a guide pulley
Compatibility:
RD-R7000/5800-GS/M7000-11/M6000-GS/U5000
