The Shimano EW-SD300-I is a 650mm Di2 E-Tube electric wire for the second-generation 12-speed Di2 system, supplied in the internal "built-in routing" configuration with wire holders for tidy internal cable management. It carries power and shift signals between Di2 components and uses the compact SD300 plug for routing through handlebars and frames.

Fits

  • Shimano Di2 E-Tube SD300-series electronic groupsets (12-speed Di2)
  • Any SD300 E-Tube port (derailleurs, junctions, switches, battery)
  • Connecting older EW-SD50 components requires the EW-AD305 adapter (not included)
Covered by Shimano's spare-parts warranty against manufacturing defects. For any warranty claim or support, return the item to Tune Cycles.
  • Di2 E-Tube electric wire, 650mm length
  • SD300 internal/built-in routing version — includes wire holders (Di2 tie-wraps)
  • Compact SD300 plug for routing through handlebars and frames
  • Compatible with second-generation 12-speed Di2 E-Tube systems
Part numberEW-SD300-I
TypeDi2 E-Tube electric wire (internal/built-in routing)
Length650mm
Wire diameterApprox. 2.1mm
Plug diameter3.2mm
FitsSD300-series Di2 E-Tube systems (12-speed Di2)
IncludedElectric wire + wire holders
Assembly toolTL-EW300
SKU SHM-IEWSD300IL065
Barcode # 4550170635039
Brand Shimano

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