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Shimano Dura Ace RD-R9250 Di2 Shadow RD derailleur, 12-speed, long cage (GS)

579 €
RRP 739 €
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From 27.01.2026 (Tuesday) Check availability
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Delivery method on Wednesday 28.01.2026
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Delivery method on Wednesday 28.01.2026
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Shimano Dura Ace RD-R9250 Di2 Shadow RD derailleur

Years of work by Shimano laboratories bring you seconds to the good. Speed ​​is the driving force behind the new generation of road kits. Shimano designers have perfected all components and functions to provide the ultimate in riding pleasure, whether you're sprinting to the finish line on the Champs-Élysées or climbing a nearby hill.
Product features
The Dura Ace R9250 derailleur has the fastest and most accurate shifting - 58% faster than the RD-R9150
The design includes an integrated wireless unit, charging port, power switch, LED status indicator, battery indicator
More versatile than ever thanks to one arm length - compatible with sprockets from 28 to 34 teeth
Product details
Groupset Shimano Dura-Ace
Gears 2x12, 1x12
Control type electronic
Used technology Shimano Shadow RD, Bluetooth, ANT, E-Tube
Cage type GS - medium cage
Weight 215 g
Max. the size of the large cassette pinion 34T
Min. the size of the large cassette pinion 28T
Max. the size of a small cassette pinion 11T
Min. the size of a small cassette pinion 11T
Capacity 37T
Pulleys 11T
Charging cable EW-EC300
product ID 203761
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WARNING
For assistance with installation, adjustment, and replacement of products not found in the user's manual, please consult the place of purchase or a distributor. A dealer's manual intended for professional and experienced bicycle mechanics is available on our website (https://si.shimano.com).
For safety, be sure to read this "user's manual" thoroughly before use, follow it for correct use, and save it so that you can refer back to it at any time.
The following instructions should always be followed in order to prevent personal injury, physical damage to equipment and the surrounding area. The instructions are classified according to the degree of danger or damage that may occur if the product is used incorrectly.

DANGER - Failure to follow the instructions will result in death or serious injury.
WARNING - Failure to follow the instructions could result in death or serious injury.
CAUTION - Failure to follow the instructions could result in personal injury or physical damage to equipment and the surrounding area.

For items requiring replacement, please consult the place of purchase or a distributor.
Be sure to observe the following instructions in order to prevent burns and other injuries due to fluid leakage, overheating, fire or explosion.

DANGER
- Use the specified charging cable when charging the battery. Use of any other item may lead to fire, overheating, leakage, or damage to the connected PC.
- Prevent the charging cable from getting wet, and do not touch or hold it when it is wet or with wet hands. Failure to do so may cause operational problems or electric shock.
- Use an AC adapter with a USB port with a voltage of 5.0 V DC and a current rating of at least 1.0 A DC. If you use an adapter with a current rating of less than 1.0 A, the AC adapter may heat up and cause fire, smoking, overheating, damage, electric shock, or burns.
- Do not heat the battery or expose it to fire. Failure to do so may cause the battery to burn or burst.
- Do not use or leave the battery in hot or humid places where the battery may be exposed to direct sunlight, in a closed vehicle on a hot day, or near a heater. Failure to do so may cause leakage, overheating, or bursting, resulting in fire, burns, or other injuries.
- Do not deform, modify, or disassemble the battery. Also, do not directly apply solder to the battery terminals. Failure to do so may cause leakage, overheating, or bursting, resulting in fire, burns, or other injuries.
- Do not allow metal terminals to come into contact with metal objects such as hairpins. Failure to do so may cause short circuits, overheating, burns, or other injuries.

WARNING
- Do not disassemble or modify the product. This may cause the product to malfunction, and you may fall unexpectedly and be seriously injured.
- Always grasp the cable plug when connecting or disconnecting the USB cable or charging cable. Failure to do so may result in fire or electric shock.
- If the following symptoms occur, stop using the device and contact the place of purchase. Fire or electric shock may occur.
- If a pungent-smelling smoke comes out of the AC outlet or the outlet heats up. There may be a bad connection inside the AC outlet.
- If there is thunder during charging with an AC adapter with a USB port, do not touch the device, bicycle, or AC adapter. Electric shock may occur due to lightning strike.
- Do not use a USB hub to connect the cable to the PC's USB port. Charging failure or fire may occur due to overheating.
- Be careful not to damage the charging cable. Do not damage it, modify it, bend it forcibly, twist or stretch it, place it near hot objects, place heavy objects on it, or tie it tightly together. Using it in a damaged state may cause fire, electric shock, or short circuit.
- If the battery does not fully charge after 4 hours of charging, stop charging. Failure to do so may cause fire, bursting, ignition, or overheating.
- Do not immerse the product in fresh or salt water, and prevent the terminals from getting wet. Failure to do so may cause fire, bursting, ignition, or overheating.
- Do not subject the product to strong impact or throw it. Failure to do so may cause bursting, overheating, or operational problems.
- Do not use the battery if it shows signs of leakage, discoloration, deformation, or other abnormal signs. Failure to do so may cause bursting, overheating, or operational problems.
- Clean the chain and QUICK-LINK regularly with a suitable chain cleaner. The intervals between maintenance depend on the circumstances of use and riding. Never use alkali or acid-based solvents such as rust removers. If such a solvent is used, the chain or QUICK-LINK may break, causing serious injury.
- Check that the chain is not damaged (deformation or cracking), skipping, or exhibiting any other irregularities such as erratic shifting. If any problems occur, consult the place of purchase or a distributor. The chain may break and you may fall.

CAUTION
- Store in a safe place out of the reach of small children to prevent accidental swallowing.
- Prevent grease from adhering to the metal terminals. This may cause conduction failure.
- Do not leave the charging cable connected during maintenance.

Shimano
Road Shimano
Japanese manufacturer produces road, mountain, gravel, trekking, BMX and e-bike groupsets. They also offer a whole series of components and apparel. Their range goes from wheels, footwear, eyewear to backpacks. Shimano is a traditional manufacturer known for their quality work, which is why they are the favourite choice of amateurs and professionals.
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