⭐ EJ's CNC Machined 13T Jockey Wheels – Shimano 12 Speed x 2 ⭐. Compatibility: Shimano 12-speed rear derailleurs (13T / 13T setup). Upgrade your drivetrain withEJ's derailleur jockey wheels, precision-engineered specifically forShimano 12-speed 13T/13T systems.
