Jockey wheel system 8000/9100, Gold, for Shimano 10S/11S, 12+16T with stainless steel bearing

Oversized gear wheel system for Shimano 10/11-speed derailleurs. With 12 and 16 teeth and specially treated SUS bearings. Only suitable for Shimano Ultegra 8000 & Dura Ace 9100 10/11-speed derailleurs (mechanical and electronic).