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 ...
Shimano Ultegra 9 Speed RD 6503 Triple Rear Derailleur user reviews : 4.5 out of 5 - 2 reviews - roadbikereview.com