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Please note: Product may come without standard packaging - This is so we can reduce the cost down for you!The Shimano RD-R9250 Dura-Ace Di2 12-Speed Rear Derailleur sets a new benchmark in drivetrain efficiency with its advanced Digital Integrated Intelligence (Di2) technology. Engineered for unparalleled precision and performance, this rear derailleur offers seamless wireless connectivity, automated shifting, and a host of high-tech features designed to enhance the cycling experience for serious road cyclists.Key FeaturesDigital Integrated Intelligence (Di2) Technology:Effortless Shifting: Programmed automatic motion ensures quick, smooth, and effortless gear changes at the touch of a switch.Wireless Connectivity: Acts as the system's brain, connecting wirelessly to shifters and handling charging, as well as providing ANT+ connectivity to third-party devices.Integrated Design:Charging and Connectivity Hub: Replaces the handlebar junction, centralizing the system’s charging and connectivity functions in the rear derailleur.Button and LED Indicators: Features a button for Di2 operations with an LED light indicating synchronized shift mode, setting mode, and charge status.Synchronized Shift:Automatic Gear Selection: Designed to choose the optimal gear ratio by coordinating shifts between the front and rear derailleurs.Low Profile Shadow Design:Crash Protection: Sleek design reduces damage risk in crashes, and the built-in saver function protects the inner structure from strong impacts.High-Quality Materials:Carbon Fibre Pulley Plates: Full carbon fibre inner and outer pulley plates enhance rigidity while reducing weight.Titanium B Axle Bolt: Provides additional weight savings.Cold Forged Aluminium Link Plates: High tolerance construction ensures durability and lightweight performance.Enhanced Durability and Performance:Fluorine-Coated Link Pivot Bushings: Four self-lubricating, micro-machined bushings provide low-friction shifting.DuPont Zytel Pulleys: Tough pulleys ensure long life and reduced chain noise.Wide Gear Ratio Compatibility: Compatible with 11-34T setups, accommodating both compact and traditional road double configurations.Compatibility:12-Speed E-Tube Di2: Fully compatible with Shimano’s 12-speed E-Tube Di2 systems.SpecificationsSpeed: 12-speedMaterial: Carbon fibre pulley plates, titanium B axle bolt, cold forged aluminium link platesCompatibility: 12-speed E-Tube Di2 systems, gear ratios up to 11-34TDesign: Low profile Shadow designConnectivity: Wireless ANT+ connectivity to third-party devicesOperation: Button for Di2 operations with LED indicatorsProtection: Integrated saver function for impact protectionBenefitsPrecision Shifting: Di2 electronic technology ensures precise and effortless gear changes, enhancing overall ride quality.Robust and Lightweight: High-quality materials and construction provide durability and performance without compromising weight.Centralized Connectivity: Simplifies system setup and provides additional functionality with third-party devices.Advanced Design: Low profile and synchronized shifting features ensure optimal performance and protection.User-Friendly: Easy operation with intuitive controls and indicators for seamless use.The Shimano RD-R9250 Dura-Ace Di2 12-Speed Rear Derailleur is a pinnacle of modern cycling technology, delivering unmatched drivetrain efficiency and performance. With advanced Di2 electronic shifting, a streamlined Shadow design, and robust construction, this rear derailleur is an essential upgrade for any serious road cyclist aiming for top-tier performance and reliability.