The shimano 105 rd 5800 11 speed rear derailleur features a unique design combined with the stiffest and most durable materials to create a smoother ride this shimano rear derailleur has an advanced wide link design for increased rigidity and shifting performance the super stiff construction and materials deliver the ultimate responsiveness for fast and accurate changes across the cassette and shift action is super light at only 232g the shimano 105 is incredibly light improving shifting p