Shimano 105 5800 11 speed rear mech medium cagehigh performance 11 speed 105 wide link rear derailleur features advanced wide link design increases rigidity and shifting performance super stiff for fast and accurate changes across the cassette large 11 tooth pulleys increase service life and reduce noise super light shift action compatible with 11 speed drivetrains maximum low sprocket 28 32t with double chainset maximum front difference 16t total capacity 37t average weight 232 gramsa 2 year