Originally Posted by
flypaca
That tells me that I don't have the correct hub to add a drum brake or a disk either. so I guess that I will continue tuning the cantilevers for max effort.
Some nice new Campy freewheel tandem hubs on the auction site. Threaded for drag brake. Some of the tandem vendors have new ones also.
Some new compressionless brake housing and some well adjusted fresh salmon brake pads can add a surprising amount of stopping power on clean rims. 409 and a Scotchbrite pad takes off lots of glaze.