SHIMANO DURA-ACE DI2 R9250 2x12V rear derailleur

Key element of the Groupesets top of the range from the Japanese brand, the SHIMANO Dura-Ace Di2 9250 rear derailleur rear derailleur offers the fastest gear changes, over a never-before-seen range of ratios.

The main new feature of this derailleur is the Shadow concept, well known to mountain bikers, which guarantees superior strength, particularly in the event of a fall, by placing most of the body under the derailleur. Cassette. The clever, streamlined design also guarantees stable, efficient and effortless shifting, and can handle a range of cassettes from 11 to 34 teeth.

What's more, this derailleur features Synchronized Shift technology, which improves shifting efficiency as you ride. Thanks to this system, you can control both front and rear derailleurs with a single shifter. The front derailleur detects the position of the rear derailleur and automatically shifts to the most efficient gear for the best chain line, so you never have to worry about front shifting or corrective changes again. 

An incredibly light, high-performance derailleur that shifts as smoothly as it shifts fast, delighting even the most demanding racers who simply want the best.

Ref: 7970332311718