The Dura-Ace RD-R9250 rear derailleur features a Shadow design and comes with integrated D-FLY connectivity so you can pair with Bluetooth & ANT+ compatible devices. It connects to the battery via an E-Tube wire.
Dura-Ace R9200's new Di2 platform showcases Shimano's most advanced drivetrain technology and shifting performance to date. Dura-Ace delivers 58% faster rear shifting and 45% faster front shifting compared to the current wired R9100 Di2 system. Shimano's wireless Di2 processing technology, developed in-house by Shimano, increases transmission speed and performance, offering reliable, fast shifts every single time. Further Di2 refinements include a charging port and D-FLY wireless connectivity integrated into the rear derailleur.
A new Shimano E-TUBE App (version 4.0.0) offers intuitive operations for personalizing the Dura-Ace R9200 drivetrain. Offering a suite of customizable, riders can choose between different shift speeds, customize shift button mapping (what buttons perform which functions), program different automatic shift modes like Synchro and Semi-Synchro shifts, fine-tune shifting, and connect with third party bike computers.
B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.
The product weight specified is an approximate weight based on the manufacturer's specifications (if available) or our measurement of one or two examples. For most products, the weight will typically vary by 5% to 10%.
Mfg PartNum: IRDR9250F
Top sprocket_Max.: 14T
Top sprocket_Min.: 11T
Low sprocket_Max.: 34T
Low sprocket_Min.: 28T
Pulley Teeth: 11
Mount Type: Standard Rear Hanger
Upgraded my 11 Speed Dura-Ace to 12 Speed. Curious about the Design / mfg + Looks.
It also helped clean up the cockpit by eliminating the lever wires.
Shimano just works well - Yes, I'm a Shimano fan using Ultegra (big bang for the buck) and Dura-Ace.
11 speed Shimano (Ultegra & Dura-Ace) shifts fast - 12 speed is even faster.........smooth & quiet too
Happy with purchase