Rear derailleur Dura-Ace RD-R9100-SS for 11 speed, short cage
Weight: Approximately 158g (some sources list 161g–166g depending on configuration).
Cage Length: Short (SS), featuring carbon fiber inner and outer pulley plates for weight reduction.
Max Low Sprocket: 30T (up from 28T in the previous 9000 series).
Min Low Sprocket: 25T.
Total Capacity: 35T.
Compatibility: Designed for 11-speed drivetrains and compatible with direct mount frames.