Shimano 105 5701 10 speed rear mech10 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 10 speed drivetrains maximum low sprocket 30t short32t med with double chainset maximum front difference 16t total capacity 34t short22t total capacity 40t med weigh