Originally Posted by
TandemGeek
Santana's switch to the 'Winzip' (IRD DualBanger) caliper has also proven to be a major improvement over their previous Formula brakes and with a little tweaking -- pads and set-up -- can be made to work as well as an Avid BB7.
Maybe Santana is going to start recommending Avid discs.
"While Santana continues to encourage our friends at Avid (now owned by SRAM) to produce a disc brake adequate for tandems, their “Ball Bearing” mechanical disc (an effective brake for single bikes) is not a safe choice for tandems."