Shimano EW-SD300 Di2 eTube Wire - 1200mm

Shimano EW-SD300 Di2 eTube Wire - 1200mm Shimano

Shimano EW-SD300 Di2 eTube Wire - 1200mm

Shimano EW-SD300 Di2 eTube Wire - 1200mm

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Which Di2 Systems Use the Shimano EW-SD300 1200mm eTube Wire?

The Shimano EW-SD300 is the slimmer, dedicated internal routing wire for current-generation 12-speed Di2 systems, with the 1200mm length suited for longer routing runs, typically front derailleur to battery connections, full-suspension frame linkages, or any routing path that exceeds what the 650mm version can reach. The EW-SD300 uses a smaller diameter connector than the older EW-SD50, designed for internal routing through the tight channels in modern carbon road and gravel frames. Correct wire length keeps the installation clean and prevents excess wire coiling inside the frame cavity.

Compatible with Shimano Dura-Ace R9250 and Ultegra R8150 Di2 12-speed systems. Internal routing only. Not compatible with older Di2 systems using EW-SD50 wires without an EW-JC200 junction adapter. Measure your specific frame routing path before ordering.

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Specifications

  • Model: EW-SD300
  • Length: 1200mm
  • Routing: Internal only
  • Compatible: Shimano Dura-Ace R9250 and Ultegra R8150 Di2 12-speed
  • Not Compatible With: Pre-12-speed Di2 systems using EW-SD50 (without adapter)

FAQ

When would I need the 1200mm length instead of 650mm?

Use the 1200mm wire for longer routing runs such as front derailleur to battery on a larger frame, connections through full-suspension linkages, or any path where 650mm falls short. Measure the routing path with a length of flexible rope or cable before ordering to confirm the correct length.

Is the EW-SD300 compatible with older Di2 systems?

No. EW-SD300 uses a different connector size than EW-SD50. To connect EW-SD300 and EW-SD50 wires, a Shimano EW-JC200 junction adapter is required.

What if I order too long a wire?

Excess wire needs to be coiled inside the frame, which can cause noise and difficult installation. Always measure first and choose the shortest length that reaches with comfortable slack at each connector.

Best For

Riders building or servicing Shimano Dura-Ace R9250 or Ultegra R8150 Di2 12-speed systems who need the longer 1200mm wire for front derailleur, battery, or cross-frame routing runs.

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