Several of the high-end steel touring bikes, i.e., the Miyata 2000, Specialized Expedition, and Centurion Pro Tour, came with internal wiring, from the top of the downtube to behind the bottom bracket.
Does anyone actually use these for the generator they were intended to accomodate? Would this typically be the old style bottle generator? I remember I had one of these on my Schwinn Continental as a kid, and it seemed to incur a noticable drag. Is this true of most/all of the bottle type generators?