Shimano Dura Ace RD-9250 Rear

The Masterpiece of Precision.

Elevate your performance to the highest tier with the Dura-Ace RD-R9250. More than just a derailleur, this is the "brain" of the 12-speed Di2 ecosystem. It integrates the wireless connectivity unit, charging port, and function switch into a single, sleek carbon and alloy unit. Engineered for the professional peloton, it delivers rear shifting that is 58% faster than the previous generation, ensuring that every gear change is instantaneous, precise, and virtually silent.

Why the RD-R9250 is the Ultimate Upgrade:

• Fastest Ever Shifting: Featuring a high-speed motor and optimized signal processing, this derailleur sets a new benchmark for speed. Whether you’re attacking on a climb or shifting under the massive torque of a sprint, the RD-R9250 responds without hesitation.

• Integrated Wireless Hub: No more external D-Fly units. The wireless connectivity for your shifters and the ANT+/Bluetooth antenna for your head unit are built directly into the derailleur body.

• Universal 12Speed Versatility: Gone are the days of choosing between "Short" and "Medium" cages. A single cage length handles everything from an 11-30T to an 11-34T cassette, giving you the flexibility to swap gears based on the day's profile.

• Streamlined Charging: The integrated charging port (using the EW-EC300 cable) allows you to charge the entire system directly through the rear derailleur, eliminating the need to remove batteries or access internal junction boxes.

• Shadow RD Technology: The low-profile Shadow design tucks the derailleur closer to the frame, reducing the risk of damage in a crash and improving aerodynamic efficiency.

Technical Specifications:

• Series: Dura-Ace R9200

• Speed: 12Speed

• Max Low Sprocket: 34T

• Min Low Sprocket: 30T

• Weight: ~215g

• Connectivity: Integrated Wireless, Bluetooth, ANT+, Charging Port

• Finish: Gloss Black / Polished Alloy

The Alegro Perspective: The RD-R9250 is the definitive "no-compromise" component. It simplifies your build by consolidating charging and wireless tech into the derailleur itself, while providing the most reliable shifting experience in the world. It’s the essential heartbeat of any high-end Winspace or custom road build.

Instantaneous. Integrated. Inimitable. The Shimano Dura-Ace RD-R9250.

Setting up your Di2 for the first time? We can also help you find the correct EW-EC300 charging cable or the SD300 E-Tube wires to get your new drivetrain powered up and synchronized!