The Shimano DURA-ACE RD-R9250 is the flagship 12-speed Di2 rear derailleur — delivering 58% faster rear shifting than its predecessor, with integrated wireless connectivity and system charging in a remarkably slim, low-profile package.

Highlights

• 58% faster rear shifting than RD-R9150 for near-instant gear changes under load
• Integrated D-FLY wireless module — pairs via Bluetooth and ANT+ with head units and cycling computers
• System charging port (EW-EC300 compatible) built directly into the derailleur body
• SHIMANO SHADOW RD mechanism — ultra-low profile prevents chainstay contact in rough conditions
• Single cage length spans 11-28 to 11-34 cassettes, covering all DURA-ACE 12-speed cassette options
• CFRP cage plates reduce weight while resisting torsional flex for precise alignment
• Dual 11-tooth pulleys with steel bearings for low-friction, quiet running
• Compatible with both direct mount and conventional B-bolt hanger designs
• One EW-SD300 connection port for system integration (battery, junction box)

SHADOW RD Technology

The SHIMANO SHADOW RD mechanism sits with an exceptionally low profile beneath the chainstay, reducing the risk of impact damage and chain slap noise during hard efforts or rough roads. Single-tension construction eliminates the need for a clutch mechanism while maintaining silent, controlled chain management at race speeds.

Di2 Electronic Precision

As part of the DURA-ACE R9200 Di2 groupset, the RD-R9250 delivers electronically actuated shifting with repeatable, sub-second precision across all 12 sprockets. The integrated function button, status LED, and charging port are all housed within the derailleur body, keeping the cockpit clean. D-FLY wireless connectivity allows real-time gear position display and synchronised shifting with compatible Shimano Di2 components via Bluetooth or ANT+.

Compatibility & Fit

Designed for use with SHIMANO DURA-ACE R9200 and compatible 12-speed Di2 groupsets. Works with SHIMANO 12-speed road cassettes (CS-R9200) from 11-28T through to 11-34T — a single cage covers all options without swapping. Requires a compatible Di2 battery (BT-DN300 recommended), EW-SD300 wiring, and a frame with appropriate Di2 routing. Accepts both direct mount and conventional hanger mounting configurations. Not compatible with mechanical (non-Di2) systems or 11-speed components.