Originally Posted by
Polaris OBark
I have heard there is a second type of Di2 wire that is narrower. I don't know if they are cross-compatible, but that might be a way.
The EW-AD305 will allow using the newer generation wiring with older gen systems…it appears that you’d need three total wires to make it work: two older gen (SD300 wires on the ends) with two of these adapters to run the smaller SD50 current gen wiring.