The Shimano Tiagra Front Derialleur (2x10-speed) 28.6/31.8mm is sleek, balanced and consistent. The Tiagra 4700 series provides serious entry-level riding performance with cascaded technology from DURA-ACE.   Shimano Tiagra Front Derialleur Features  10-speed compatible Tiagra front derailleur delivers pro features to sport-level road riders Extra wide pivot link increases rigidity while reducing flex for improved shifting response Aluminium links and band to save weight and increase rigidity For road cycles equipped with 10-speed drivetrains Multi clamp band to fit 28.6 and 31.8 frame tubes Plated steel chain cage Maximum capacity of 16 teeth, for outer rings up to 53 tooth