Campagnolo athena triple 11 speed rear mech absolute precision the rear derailleur with ultra shift geometry is designed to give you the certainty of immediate shifting in all conditions specifications upper to lower pulley axle 55mm aluminium outer plate die cast aluminium upper body lightened special rubber pulleys parallelogram with 11s geometry weight 209g technologies ultra shift parallelogram designed to wrap around the rear derailleur bodies and increase the overall stiffness of