Shimano Ultegra RD-6600-GS 9/10-Speed Rear Derailleur | REI Co-op
Hi! I have these Ultegra 6700 shifters and a Deore 9 speed rear derailleur. They work fine, but they "lose adjustment" pretty easily. I'm thinking about upgrade into this Shimano GRX RD-RX400 (10 speed) rear derailleur. Does anyone here have this setup ...