These wires are smaller than the older EW-SD50. The wire diameter is about 2.1mm and the plug itself is 3.2mm.
Despite the obvious differences in size between the EW-SD50 and the EW-SD300, they’re both E-Tubes. You can wire up any Di2 series using EW-SD300 wires, but you’ll need the EW-AD305 adapter.







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