Shimano EW-EC300 Di2 Magnetic Charging Cable
A 2-in-1 USB-A and USB-C magnetic charging cable for supported Shimano 12-speed Di2 bikes that use the EW-EC300 rear-derailleur charging interface. Keep one at home, one near the indoor trainer, or one in your race/travel kit so a low Di2 battery does not stop a ride.
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Dual USB-A + USB-C input: works with common wall chargers, power banks, laptops, and travel adapters without needing a separate cable type.
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EW-EC300 magnetic connector: 4-pin magnetic charging interface for compatible Shimano 12-speed Di2 rear derailleurs.
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Made for modern Di2 groups: intended for bikes in the R9270, R9250, R8170, R8150, and R7170 model families when they use the EW-EC300 charging port.
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Long 2000mm reach: enough length for workshop benches, wall outlets, trainer setups, travel cases, and awkward bike storage spots.
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Stable 5V/2A charging: built for steady charging with protection against overheating, overcharging, and short circuits.
Compatibility checklist before ordering
| Check |
What to confirm |
| Charging port |
Your bike should charge through an EW-EC300-style magnetic rear-derailleur port. |
| Di2 generation |
Best fit for supported Shimano 12-speed Di2 road systems, including Dura-Ace, Ultegra, and 105 Di2 model families listed above. |
| Connector shape |
Compare this cable's magnetic 4-pin connector with your current Shimano charging cable before buying. |
| Power source |
Use a standard 5V USB charger, power bank, laptop, or wall adapter through USB-A or USB-C. |
| Not for |
Older Di2 systems or any bike that uses a different charging interface. It is not a universal Di2 charger. |
Why riders keep a spare Di2 charging cable
Di2 batteries usually last a long time, which makes the charger easy to misplace. A dedicated spare cable in your tool roll, trainer area, or bike travel case is cheap insurance before race weekends, bike trips, and winter indoor blocks.
Best use cases
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Home workshop: leave a cable on the bench for quick top-ups and maintenance checks.
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Indoor trainer: keep charging close to the trainer so the bike is ready before structured workouts.
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Travel and race bags: pack a compact charging setup with your head unit, lights, camera, and phone cables.
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Backup replacement: useful if your original EW-EC300 cable is lost, damaged, or kept in another location.
What is included
- 1 x 2-in-1 USB-A / USB-C magnetic charging cable for Shimano EW-EC300-style Di2 charging.
- Cable length: 2000mm / 78.74 in.
- Connector size: about 10mm / 0.4 in.
FAQ
Is this an original Shimano EW-EC300 cable?
No. This is a GodLOL-compatible replacement charging cable for riders who need an EW-EC300-style Di2 charging spare.
Does it work with every Shimano Di2 bike?
No. Shimano Di2 charging interfaces vary by generation. Please match the connector shape and charging port on your bike before ordering.
Can I use either USB-A or USB-C?
Yes. The cable has both USB-A and USB-C input options, so it can connect to many common chargers and power banks.
Which model searches is this page built for?
Common search terms include Shimano EW-EC300 charging cable, Di2 charging cable, Shimano Di2 charger cable, R9270 charger, R9250 charger, R8170 charger, R8150 charger, and R7170 charger.
Need a smaller travel adapter instead?
For a compact adapter-style option, compare the Shimano Di2 USB-C Adapter EW-EC300 Style.
