Shimano Dura-Ace Di2 RD-R9150 11-speed Shadow Rear Derailleur

The Dura-Ace Di2 RD-R9150 by Shimano – electronic rear derailleur with Shadow technology
With the Dura-Ace Di2 RD-R9150 rear derailleur, Shimano introduces Shadow-profile technology known throughout the MTB sector. Thanks to its extremely flat construction and more direct positioning, damage is unlikely and cleaner shifting operation possible, even on uneven surfaces. As usual with Di2, this is done seamlessly with very little effort. The rear derailleur also features Synchro Shift functionality, allowing the front derailleur to adjust automatically, and here is further complemented by Semi-Synchro Shift. This means the rear derailleur is shifted accordingly when the front derailleur is engaged. The RD-R9150 consists almost entirely of super-light carbon and with its short cage length (SS type) for 11-speed cassettes up to 11-30. A direct mount option is also available.
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 R9150Application:Road, Triathlon & Time TrialGearing:11-speedMount:standard (Direct Mount compatible)Capacity:33-toothCompatibility:Shimano Road 11-speedTechnical Information:Derailleur Pulleys:11-toothOuter Cage Material:carbon (CFRP)Inner Cage Material:carbon (CFRP)Other Materials:aluminium, carbon (CFRP)Compatibility:Power Cable:EW-SD50 (1 x connection)Shift/Brake Lever:ST-R9150, ST-R9160, ST-R9170, ST-R9180, ST-9070, ST-R8050, ST-R8060, ST-R8070, ST-9071, ST-6870, ST-6871, ST-RX815, ST-R785Cassette:CS-R9100, CS-9000, CS-6800, CS-5800, CS-R8000, CS-R7000Chain:CN-9000, CN-6800, CN-HG901-11, CN-HG701-11, CN-HG601-11, CN-LG500Features:ergonomic and effortless shiftingShimano Synchro Shiftrear derailleur with flat profile: Shimano Shadow RDcompact and clean looksderailleur pulley bearings sealedpainted cage plates4 pivot bushings, fluorine-coatedE-Tube project ensures firmware updatesTechnology:Shadow RD
Shadow rear derailleurs from Shimano have a very flat profile, allowing for a more aggressive riding style by minimising the risk of getting stuck on obstacles. In addition, the single preload ensures that the rear derailleur does not hit the chain stay even on very uneven ground. All of this contributes to a quiet, clean-operating gearshift.

Digital Integrated Intelligence (Di2)
Di2 systems are the electronic shifting systems from Shimano. They are based on the SEIS, the Shimano Electronic Intelligent System, which takes over the index shifting function from the mechanical components, only via power cables or radio signals and not via a Bowden cable. Shifting is done by simply pressing a button. This has the advantage that no great effort is required, your concentration on the ride is not disturbed and operation is easy even with cold hands. In addition, the electronic gear changes are very fast and highly precise. There is also no risk of a defective circuit due to dirty cables or other problems. You can adjust individual settings via the E-Tube Project, such as adjusting the shifting speed, the number of shifting operations per button press or the Synchro or Semi-Synchro shifting function. Shimano offers an app for this purpose. Gear maintenance and firmware updates are also done via E-Tube, with the bike connected to a PC running the appropriate E-Tube software for more extensive workshop work.

Shimano Synchronized Shift
Shimano’s synchronised shifting function is a shifting mode that automatically matches the Di2 rear derailleur and Di2 front derailleur. It is activated either via the E-Tube platform or via the rear derailleurs with a function button. Synchro Shift means that the front derailleur automatically selects a suitable gear depending on the position of the rear derailleur, while Semi-Synchro Shift means that a suitable rear derailleur position is automatically set when you operate the front derailleur. This gives you the advantage that you only have to concentrate on one side of the shifting process and are not thrown off-rhythm by sudden unfavourable changes to the gear ratio.
Models:short:
Cage Length:SSMax. Largest Sprocket Teeth:30-toothMin. Largest Sprocket Teeth:25-toothMax. Smallest Sprocket Teeth:14-toothMin. Smallest Sprocket Teeth:11-toothMax. Chainring Difference:16-toothTotal Capacity:33-toothManufacturer Number:I-RDR9150SSContents:1 x Shimano Dura-Ace Di2 RD-R9150 Rear Derailleur