Shimano Dura-Ace Di2 R9250 12-Speed Rear Derailleur
The Shimano Dura-Ace Di2 R9250 Rear Derailleur acts as the brain for the 12-speed semi-wireless gear set-up. It houses the wireless hardware that communicates with the shift levers but is also hard wired to the front derailleur and the battery, acting as the master link for the whole system. Additionally, it’s also the system’s charging point, provides ANT+ connection to third party devices, features the button responsible for all Di2 operations and integrates an LED light that provides information on shift modes and battery charge levels. It works within several shift settings that are fully programmable via the Di2 app, granting personalised and intuitive shifting behaviour.
From a mechanical standpoint, a longer cage length means that compatibility with 11-28 through to 11-34 ratio cassettes is fully supported. The cage is made from carbon to increase rigidity and lower weight, while the cold-forged aluminium link plates of the derailleur body are strong to donate snappy gear changes and highly resistant to corrosion. The overall profile is realised via Shimano’s Shadow concept to create a minimal silhouette, and a “fuse” function automatically activates during a crash to protect it from damage. DuPont Zytel pulleys complete the design, guaranteeing durability and damping drivetrain noise.
Features
- A 12-speed Di2 rear derailleur that provides quick and smooth gear changes at the touch of a button
- The rear derailleur is the brains of the system and wirelessly connects to the shifters
- It acts as the system charging point, provides ANT+ connection to 3rd party devices
- It features an integrated button for Di2 operations
- Its LED light denotes synchronized shift mode, setting mode and charge requirements
- An option to program the shifting action makes gear changes smoother and intuitive
- Optional Synchronised Shift mode automatically chooses the next biggest gear, whether the rider is already using the outer or inner chainring
- Low profile Shadow derailleur design
- Derailleur contains a saver (fuse) function, where the inner structure is protected from strong impacts
- A longer cage is compatible with 11-28T through to 11-34T cassettes within a double chainring configuration
- Full carbon fibre inner and outer pulley plates enhance rigidity and reduce weight
- Titanium B axle bolt for further weight savings
- High tolerance cold-forged aluminium link plates and body construction is extremely light and durable
- Four self-lubricating micro-machined fluorine-coated link pivot bushings provide low-friction shifting
- Pulleys are made of tough DuPont Zytel for longer life and less chain noise
- 12-speed E-tube Di2 compatible
- Manufacturer claimed weight: 215 grams
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