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The Shimano Dura-Ace Di2 R9250 2x12-speed Groupset with 40-54 Crank and Rim Brake - Speed and efficiency

The Dura-Ace Di2 R9250 Road groupset from Shimano consists of a 2x12-speed crank with 40-54 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 or 11-34 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.


Dura-Ace Di2 R9250
Shifters & Derailleurs:
2-speed, 12-speed (electronic)
rim, mechanical


170.0 mm, 172.5 mm, 175.0 mm (gradation 40-54)
11-30, 11-34
Front Derailleur:
Rear Derailleur:
long cage


  • battery mounting internally in the seatpost, running time approx. 1000 km
  • STIs for wired electronic shifting
  • front derailleur with more compact design than previous model, connected to battery via cable
  • rear derailleur with wireless chip, LED display, charging socket and function button, connected to battery via cable

Additional Components Needed:

The following components are still required for putting the Dura-Ace Di2 R9250 groupset into service:
  • Bottom Bracket: Shimano recommends BB-R9100 or SM-BB92-41B PressfitHollowtech II.
  • 4 x EW-SD300-I power cables: 1 x from battery to front derailleur (max. 1500 mm), 1 x from battery to rear derailleur (max. 1700 mm), 1 x from battery to right STI and 1 x from right to left STI*
  • recommended: rubber grommets for internal cable routing

* To determine the correct cable lengths, the bike must be measured as follows:
  • Distance between battery and front derailleur
  • Distance between battery and rear derailleur = distance between battery and bottom bracket + distance between bottom bracket and rear derailleur
  • Distance between battery and right STI = distance between battery and bottom bracket + distance between bottom bracket and right STI
  • Distance between left and right STI = handlebar width centre-to-centre + 2 x handlebar reach

There is also the option of wiring via the EW-JC304 junction box. You can find more information on assembly in the Shimano manual or contact our service staff.


Shimano Dura-Ace R9250 Di2 2x12 40-54 groupset, comprising:
  • 1 x Shimano Dura-Ace crankset (FC-R9200)
  • 1 x Shimano Dura-Ace Di2 rear derailleur (RD-R9250)
  • 1 x Shimano Dura-Ace Di2 front derailleur (FD-R9250)
  • 1 x pair Shimano Dura-Ace Di2 (ST-R9250) shift/brake levers
  • 1 x Shimano Di2 battery (BT-DN300)
  • 1 x Shimano Di2 charging cables (EW-EC300)
  • 1 x Shimano Dura-Ace cassette (CS-R9200)
  • 1 x Shimano XTR Quick-Link chain (CN-M9100)
  • 1 x pair Shimano Dura-Ace rim brakes (BR-R9200), front and rear
  • 1 x Shimano aluminium cassette lockring
  • 1 x Shimano master link
  • 1 x Shimano TL-EW300 cable tool
  • 1 x Shimano crank bolt
  • 1 x 10.5 mm caliper bolt for rear rim brake
  • 1 x 18 mm caliper bolt for front rim brake
  • 1 x 27 mm caliper bolt for front rim brake
  • 2 x pair R55C4 brake pads

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