Wide Link Design 105 Double Front Derailleur For Increased Rigidity & enhanced Shifting Response Wide Inner Link Increased Rigidity & Takes Front Shifting Performance To A New Level, Especially Under Heavy Load For 11-Speed Drivetrains Toggle Link Design Is Light Action With Short Lever Movement & 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 46-53 Tooth Outer The Aluminium Parts Are Coated To Resist Corrosion & Maintain Their Great Looks