Lightweight front e type bottom bracket mount dyna sys 10 speed double mtb derailleur for smooth gear changesdual pull design for use with top or bottom cable routingreinforced light weight chain guide adds rigidity and improved responsewider pivot link increases torsional rigidityeasy access angled adjustment screws and clamp boltangled inner chain guide tail for increased tyre clearancedyna sys 10 speed design for use with dyna sys 10 speed mtb drivetrainsspecifically developed for 68 and 73