Shimano Dura-Ace RD-R9250

The Shimano Dura-Ace RD-R9250 is the heart of Shimano’s premier 12-speed Di2 ecosystem. This rear derailleur is faster, smarter, and more integrated than ever before. In a significant departure from previous generations, the RD-R9250 now serves as the system's "brain" and charging hub, housing the wireless transceiver, charging port, and function button. With a 58% increase in shifting speed over the already-rapid R9150, this derailleur offers the most precise and lightning-fast gear changes available in the cycling world. Its single-cage length design is now compatible with cassettes up to 34T, making it as versatile as it is high-performing.

Key Features

• Integrated Wireless Hub: Houses the ANT+/Bluetooth transceiver for wireless communication with the shifters and direct connection to the E-TUBE PROJECT app.

• Unified Charging Point: Features the same magnetic charging port used for the entire system, eliminating the need for a separate junction box.

• Shadow RD Profile: Low-profile design protects the derailleur from impact and ensures stable shifting performance even on rough roads.

• CFRP Construction: Extensive use of Carbon Fiber Reinforced Polymer (CFRP) in the plate and link components minimizes weight while maintaining extreme rigidity.

• Wide-Range Capability: A single cage length handles everything from an 11-28T up to an 11-34T 12-speed cassette.

Specifications

• Drivetrain Speeds: 12-Speed Di2

• Maximum Low Sprocket: 34T

• Minimum Low Sprocket: 28T

• Total Capacity: 37T

• Pulley Teeth: 11T

• Communication: Wireless (Di2) / Wired (EW-SD300)

Typical Components Included

• RD-R9250 Rear Derailleur

• B-Axle Washer

• User Manual

• (Note: EW-EC300 Charging cable sold separately)