The new flagship from Shimano, Dura Ace has arrived with their latest 12-speed rear derailleur.

The rear derailleur has been given a new and improved design as well as a new motor inside the rear derailleur, which has made the gear change even more efficient. It switches 58% faster than the R9150 series.

The rear derailleur has a maximum capacity of 34 teeth and can only be used with Shimano 12-speed cassettes.

Only compatible with HG+ chains from Shimano.

The DI2 system is charged through the rear derailleur where there is a charging plug. It is therefore referred to as the main unit of the system.