Electric Wire / e-Tube cable
The Shimano EW-SD50 electric wire connects the individual parts of the Di2 system to each other. They're available in a bunch of different sizes. You'll need about 6 of them, depending on your specific setup and frame size. The generally available sizes are:
That 1600mm wire is meant to be used on E-Bikes only, but I haven't seen it fail on road bikes myself. If you're thinking of using this on a road bike - you probably can.
You can connect EW-SD50 wires to the next generation EW-SD300 E-Tube wires using the EW-AD305 adapter. This is good news, because that means you can use all of your older components with future Di2 series.
Details & Specifications
|Shimano model number:||EW-SD50|
|E-Tube Port type:||SD50|
|Component series:||Non-series components NON (All)|