Shimano Dura Ace 9250 12s

The Shimano Dura-Ace Di2 R9250 2x12-speed Groupset with 34-50 Crank and Rim Brake - Speed and efficiency
This Dura-Ace Di2 R9250 road groupset from Shimano consists of a 2x12-speed crank with 34-50-tooth gradation, a rim brake set and an electronic rear derailleur and front derailleur. Of course, a rechargeable battery, a Quick-Link chain and a cassette with 11-30 teeth are also included.

Shimano has uncompromisingly designed the Dura-Ace R9250 for speed and performance. User-friendliness, efficiency and safety also played a major role in development. If you prefer to ride with rim brakes rather than disc brakes, you still have the option of reverting to the tried-and-tested double-pivot side-pull design. In this case, the STIs are connected to each other via a cable and to the battery via another cable coming from the right shift/brake lever, which in turn is wired to the front derailleur on the one hand and to the rear derailleur on the other. Shifting gears is undertaken with the usual precision and speed. A twelfth sprocket on the cassette in combination with a very clever gradation means that you have a wider gear selection at your disposal, and are optimally prepared for any terrain. In addition, Hyperglide+ technology familiar in MTB sport ensures smooth gliding of the chain even under loads. Conveniently, the Dura-Ace 12-speed cassettes are also compatible with older Shimano road freehubs.
Information regarding the return of batteries and electrical equipment:
Information on the return and disposal of batteries and electrical equipment can be found here.
Specifications:
Series:
Dura-Ace Di2 R9250
Application:
Road
Shifters & Derailleurs:
2-speed, 12-speed (electronic)
Brakes:
rim, mechanical
Components:
Crank:
170.0 mm
Cassette:
11-30
Front Derailleur:
braze-on
Rear Derailleur:
long cage
Features:
battery mounting internally in the seatpost, running time approx. 1000 km
STIs for wired electronic shifting