Join Date: Apr 2005
Location: BicycleSPACE warehouse in SW Washington DC
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In terms of functionality and performance,they are identical. It's the mechanics(actuation) that are different. Most discs require a long cable pull like V brakes,whereas canti and caliper brakes require a short pull. Most drop bar levers are short pull. In order to get discs to work with drop bars,Avid and Shimano redesigned some of their calipers to be short pull. I've never used the Shimano's,but I've have both versions of the BB7 and the only difference is the actuator arm and the markings on the caliper.
Since you have long pull levers,you'll need the MTB versions.
C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport,Dahon Speed Pro TT,Brompton S6L/S2E-X