Campagnolo athena 11 speed rear mechthe athena rear derailleur has the same geometry as the top of the range 11x models and absolute precision is the result the result is fast and precise shifting in all the gears the pulleys are specially designed to reduce vibrations and make the drivetrain perfectly quiet features upper to lower pulley axle 55mm aluminium outer plate parallelogram with 11s geometry die cast aluminium upper body lightened special rubber pulleys weight 209gbuy ca