GRX DI2 RD-RX815 REAR DERAILLUER 34T 11 SPEED (ULTEGRA 11 SP DI2 COMPATIBLE)

With the Shimano GRX Di2 RD-RX815 electronic rear derailleur you shift smoothly and quietly on rough terrain. An adjustable chain stabilizer and the Shadow RD+ technology, protect you from chain slaps and drops. RD-RX815 is not only compatible with GRX shift/brake levers, but also with all current Shimano 11-speed Road Di2 Dual Control STIs. Use this rear derailleur when riding an 11-30 or 11-34 cassette.


SPECIFICATIONS

Series: GRX Di2 RX815
Application: Gravel, Cyclocross, City & Touring
Gearing: 11-speed
Mount: Standard (Direct Mount compatible)
Capacity: 38-tooth
Compatibility: Shimano Road 11-speed
Max. Largest Sprocket Teeth: 34-tooth
Min. Largest Sprocket Teeth: 30-tooth
Max. Smallest Sprocket Teeth: 11-tooth
Min. Smallest Sprocket Teeth: 11-tooth
Max. Chainring Difference: 17-tooth
Total Capacity: 38-tooth


TECHNICAL INFORMATION

Derailleur Pulleys: 13 tooth (bottom, tension pulley), 11 tooth (top, idler pulley)
Outer Cage Material: Aluminium
Inner Cage Material: Aluminium
Other Materials: Aluminium, composite material (GFRP)


COMPATIBILITY

2x11-speed
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-R785
Cassette: CS-R9100, CS-6800, CS-5800, CS-R8000, CS-HG800-11, CS-R7000, CS-HG700-11
Chain: CN-9000, CN-6800, CN-HG901-11, CN-HG701-11, CN-HG601-11, CN-LG500

HIGHLIGHTS

Quiet and smooth shifts on rough terrain
Gravel-specific tension
Damping can be switched on and off depending on terrain
Painted cage plates
Derailleur pulley bearings
4 pivot bushings, fluorine-coated
E-Tube project ensures firmware updates


TECHNOLOGY

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.

Shadow RD+
Shadow Plus rear derailleurs are just as low-profile as Shimano's Shadow rear derailleurs. In addition, a stabilizer with on/off switch is used to reduce chain slap and thus counteract chain drop. At the same time, this results in a quieter drive. Weight is also saved compared to other chain restraint devices.