For the new DURA-ACE 9100 series Shimano has redesigned each component of the system to provide the most innovative component group of all time.
The 11-speed Dura-Ace rear derailleur has been fitted with low-friction polymer coated trains to enable a simpler, faster operation. This new rear derailleur is also equipped for the direct mounting, which provides a more rigid base for improved shifting and minimizes the likelihood of damage to the frame due to collisions.
Format: 11-speed, short cage
Compatibility: 11-speed Shimano Dura Ace ST-R9100, R9120 ST, ST-9000
Total capacity: 35 teeth
Max. Differential front: 16 teeth (difference between the smallest and largest chainring)
Max. Largest sprocket: 30 teeth
min. Largest sprocket: 25 teeth
Max. smallest sprocket: 14 teeth
min. smallest sprocket: 11 teeth