I'm considering putting 1 disc on my touring bike. It will likely be on the rear, since I don't want to upgrade a perfectly nice (and light) fork. Also, my low-rider racks would likely interfere. The bike is an old Cannondale, with fat shainstays, and ovalised seatstays. The dropout spacing is 126mm. I am using a Blackburn rack on the rear.
Are there any disc hubs which will fit? How much weight will it add? Is this even feasible?
Comments welcome, flames ignored.