Shimano Dura-Ace Di2 R9250 12-Speed Rear Derailleur

From £624.00

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Sigma Sports
£624.00

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Price last checked: 03/10/2026

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Shimano Dura-Ace Di2 R9250 12-Speed Rear Derailleur

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.

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34T £624.00

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About: Shimano

Shimano is a leading brand in the cycling industry, renowned for its high-quality components and innovative technology. The company offers a range of cycling products, including drivetrains, brakes, wheels, pedals, and shoes. Shimano's drivetrain components, such as its derailleurs and shifters, are widely regarded as some of the best on the market, providing smooth and reliable shifting for cyclists of all levels. The company's disc brakes are also highly regarded, providing excellent stopping power and modulation. With a commitment to innovation and a focus on the needs of cyclists, Shimano continues to be a go-to choice for cyclists looking for top-of-the-line components for their bikes.

About: Sigma Sports

Sigma Sports is a leading cycling and triathlon retailer based in the United Kingdom. Sigma Sports provides a comprehensive range of products catering to cyclists, triathletes, and outdoor enthusiasts. The store offers a diverse selection of bicycles, cycling accessories, apparel, and gear from well-known brands. Sigma Sports is known for its commitment to quality, customer service, and expertise in the cycling industry. The retailer has both a physical store and a robust online presence, making it convenient for customers to explore and purchase products. Sigma Sports is often associated with a wide range of cycling disciplines, including road cycling, mountain biking, and triathlon.