Xt m8025 double front gear low clamp top swing down pull 11 speed lightweight front top swing low clamp band mount dyna sys11 11 speed double mtb derailleur for smooth gear changes down pull design for use with bottom bracket cable routing reinforced light weight chain guide adds rigidity and improved response wider pivot link increases torsional rigidity easy access angled adjustment screws and clamp bolt angled inner chain guide tail for increased tyre clearance dyna sys11 11 speed design f