The Shimano Dura-Ace RD-R9250 is the flagship wireless rear derailleur for road racing — a 12-speed Di2 unit that shifts 58% faster than its predecessor while weighing just 215 grams. As the electronic brain of the Dura-Ace R9200 drivetrain, it delivers seamless, silent gear changes whether you're sprinting from a criterium corner or grinding up a long climb.

Highlights

• 58% faster shifting: Dramatically quicker rear gear changes than the previous-generation RD-R9150.
• Integrated wireless unit: Acts as the central hub of the Di2 system, broadcasting via Bluetooth LE and ANT+ to cycling computers and training apps.
• Shimano Shadow RD design: Ultra-low profile keeps the derailleur body close to the cassette, preventing chainstay contact in rough conditions.
• Single cage length: One cage accommodates the full cassette range from 11T up to a 34T maximum sprocket (37T total capacity).
• Lightweight construction: CFRP rear derailleur plate and hollow B-axle reduce weight to just 215g.
• Fluoric-coated link bushings: Smooth, long-lasting pivot action for consistent, precise shifting over thousands of kilometres.
• Built-in charging port and LED: Single EW-EC300 charging port for the whole Di2 system; LED displays battery level and system status.
• E-TUBE customisation: Adjust shift speed, button mapping, and synchronised shift settings via the Shimano E-TUBE PROJECT app.

Wireless Di2 Technology

The RD-R9250 acts as the wireless hub of the entire Di2 system. Its integrated D-FLY wireless unit connects to Garmin, Wahoo, and other ANT+/Bluetooth-compatible cycling computers, enabling automatic gear display and synchro-shift customisation without additional hardware. The single integrated charging port simplifies battery maintenance across the whole groupset.

Shadow RD and Hyperglide+ Performance

Shimano's Shadow RD mechanism keeps the derailleur tucked tight to the cassette with a super-low profile. The single-tension construction minimises noise and eliminates chainstay contact even on rough roads. Combined with Hyperglide+ cassette and chain technology, the RD-R9250 achieves precise, load-bearing shifts across all 12 sprockets — smooth in both directions whether you're seated or sprinting.

Compatibility & Fit

The RD-R9250 is a 12-speed Di2 rear derailleur designed for road bikes. It is cross-compatible with the full Dura-Ace R9200 and Ultegra R8100 Di2 ecosystems, and also works with 105 Di2 (R7150) shifters. Compatible STI levers include ST-R9250, ST-R9270, ST-R9160, ST-R9180, ST-R8150, ST-R8170, and ST-R8060. Supported cassettes include the CS-R9200 and CS-R8100 series (11-28T, 11-30T, 11-34T). Maximum sprocket size is 34T; total capacity is 37T. Works with Shimano 12-speed chain (CN-M9100). Compatible with both conventional rear hanger and direct mount frames.