Short answer is that you will also need either a QBP Travel Agent adapter (http://www.sheldonbrown.com/gloss_tp-z.html#travelagent) or a set of brake levers that support V-brakes. V-brakes have a different mechanical advantage than the cantis that you have, so you will need brake levers that support V-brakes. See http://www.sheldonbrown.com/gloss_bo-z.html#brakelever for more info.