Shimano 105 level front derailleur for 12 speed rear cassettes. Wide link design 105 double front derailleur for increased rigidity and improved shifting response Wide inner link increased rigidity and takes front shifting performance to a new level, especially under heavy load For 12-speed drivetrains Toggle link design is light action with short lever movement and less effort at the end of shifting stroke Designed to work with the wider gear pitch spacing Shimano chainsets without sacrificing shifting performance on bikes with 135 / 142 mm O.L.D. Support bolt provides added stability Maximum capacity of 16 teeth with 50-52 tooth outer The aluminium parts are coated to resist corrosion and maintain their great looks