Joined: Dec 2004
Posts: 12,560
Likes: 799
From: Middle of da Mitten
Bikes: Trek 7500, RANS V-Rex, Optima Baron, Velokraft NoCom, M-5 Carbon Highracer, Bacchetta Quattro, Catrike Speed
The original pic looks like a drum brake. Note the torque arm on that chainstay. A disc drag brake for a tandem would have a really big rotor -- much bigger than in the pic. I think giving the stoker control of the drag brake is the most common setup.