SHIMANO DURA-ACE DI2 R9250 12V rear derailleur

The SHIMANO DURA-ACE DI2 R9250 12V Rear Derailleurthe benchmark gear in the World Tour peloton, offers the fastest gear changes in a range of gears never seen before.

This derailleur now adopts the Shadow RD concept, well known to mountain bikers for its superior strength, particularly in the event of a fall, by placing the bulk of the body under the 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 for more efficient gear shifting when you're on the move. 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. 

One derailleur Shimano Dura-Ace Di2 R9250derailleur, incredibly light and powerful for smooth, fast gear changes, will delight the most demanding racers who simply want the best.

Manufacturer's manual

Ref: 7970332311718