I've used a lever for a triple on a compact double crank for a couple of years with no issues. That same bike now also has a wide-range cassette (11-34) on it with an Ultegra dérailleur (6700 GS). The derailleur's capacity was the key number in determining if it would work with the cassetteI wanted to use. Previous model numbers wouldn't have worked for what I wanted to do.