Shimano EW-SD300 Di2 eTube Wire - 650mm

Shimano EW-SD300 Di2 eTube Wire - 650mm Shimano

Shimano EW-SD300 Di2 eTube Wire - 650mm

Shimano EW-SD300 Di2 eTube Wire - 650mm

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Which Di2 Systems Use the Shimano EW-SD300 650mm eTube Wire?

The Shimano EW-SD300 650mm is the shorter internal routing wire for current-generation 12-speed Di2 systems, suited for rear derailleur connections, junction-to-derailleur runs, and shorter routing sections within the frame. The EW-SD300 uses a smaller diameter connector than the older EW-SD50, designed for the tight internal routing channels in modern carbon road and gravel frames. Choosing the correct length keeps the Di2 installation clean. Excess wire coiled inside the frame creates noise and complications during assembly. Measure your routing path carefully before selecting a wire length.

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.

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Specifications

  • Model: EW-SD300
  • Length: 650mm
  • 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 use the 650mm length versus the 1200mm?

The 650mm wire is the most commonly used length for rear derailleur runs and shorter junction connections within the frame. Use the 1200mm for front derailleur wiring, battery connections, or any routing path that the 650mm cannot reach. Measure before ordering.

Is the EW-SD300 compatible with older Di2 systems?

No. EW-SD300 uses a different connector size from EW-SD50. A Shimano EW-JC200 junction adapter is required to connect EW-SD300 and EW-SD50 wires across Di2 generations.

Can I cut an EW-SD300 wire to a shorter length?

No. Di2 E-Tube wires come pre-terminated with proprietary connectors and cannot be cut and re-terminated in the field. Order the correct length for your routing path.

Best For

Riders building or servicing Shimano Dura-Ace R9250 or Ultegra R8150 Di2 12-speed systems who need a 650mm wire for rear derailleur connections and shorter internal routing runs.

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