Di2 uses a "barrel connector" so the thing appears like one wire to the consumer. This also allows DC power to be transmitted over the single wire. On a bike, y

Di2 uses a "barrel connector" so the thing appears like one wire to the consumer. This also allows DC power to be transmitted over the single wire. On a bike, you don't have a return path for current.... Never heard of a LIN bus, learn something new every day :)