Shimano Dura-Ace Di2 RD-R9250 Rear Derailleur - OEM Packaging

OEM Packaging:

This item comes from the original equipment manufacturer and is lacking the retail packaging.

Information regarding the return of batteries and electrical equipment:

You can find information on the return and disposal of used batteries, accumulators, and electrical equipment here.

Specifications:

Series:

Dura-Ace Di2 R9250

Application:

Road, Triathlon & Time Trial

Gearing:

12-speed

Mount:

standard (Direct Mount compatible)

Capacity:

37 teeth

Compatibility:

Shimano Road 12-speed

Compatibility – Chains:

HG 12-speed

Technical Information:

Derailleur Pulleys:

11 teeth

Outer Cage Material:

carbon (CFRP)

Inner Cage Material:

carbon (CFRP)

Other Materials:

aluminum, carbon (CFRP)

Compatibility:

Power Cable:

EW-SD300-I (1 x connection)

Shift-/Brake Lever:

ST-R9250, ST-R9270, ST-R7170, ST-R9160, ST-R9180, ST-R8150, ST-R8170, ST-R8060

Cassette:

CS-R9200-12, CS-R8100-12, CS-R8101-12, CS-R7100-12, CS-R7101-12

Chain:

CN-M9100, CN-M8100, CN-M7100, CN-M6100

Charging Cable:

EW-EC300

Features:

• Function button, charging port, and wireless system in one compact unit
• Di2 wireless chip with low interference probability, high processing speed, and low power consumption
• LED status display (battery, pairing, settings mode, Synchro Shift)
• Takes over the function of previous wireless units in establishing a wireless connection with compatible cycling computers
• Extremely high shifting speed: 58% faster than RD-R9150
• Flat design
• Connected to battery via cable
• Only one cage length for all gradations
• Firmware updates via E-Tube Project
• 4 fluorine-coated joint bushes
• Tension and guide roller bearing
• Painted cage plates

Technology:

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 indexing function from the mechanical components, only it does so via electrical cables or wireless signals instead of 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 the operation, for example, 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. Via the E-Tube platform, the so-called E-Tube Project, you can make individual settings, such as adjusting the shifting speed, the number of shifts 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.

D-Fly
Shimano D-Fly is a Near Field Communication (NFC) network that allows Shimano E-Tube electronic components (Di2, STEPS) and smartphones or compatible bike computers to communicate with each other. For example, it's possible to display information about the components on the screen or follow power meter data. Shimano provides the E-Tube Ride app just for this purpose. D-Fly is compatible with ANT+, ANT, and Bluetooth. Network partners include, for example, Garmin, Wahoo, Sigma, and Cateye for Di2 components and Garmin and Sigma for STEPS components.

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:

long:

Max. Largest Sprocket Teeth:

34 teeth

Min. Largest Sprocket Teeth:

28 teeth

Max. Smallest Sprocket Teeth:

11 teeth

Min. Smallest Sprocket Teeth:

11 teeth

Max. Chainring Difference:

16 teeth

Total Capacity:

37 teeth

Manufacturer Number:

KRDR9250A

Contents:

• 1 x Shimano Dura-Ace Di2 RD-R9250 Rear Derailleur