Tiagra FD-4700 Front Derailleurs Extra wide pivot link increases rigidity while reducing flex for improved shifting response. 52t maximum outer ring and 16t capacity. Plated steel chain cage. See Tech link below for compatibility info. 43.5mm chain line. Aluminum links and clamp band to save weight and increase rigidity. Compatible only with ST-4700 or ST-RS405 shifters. Item Specifications: Front Derailleur Clamp: 28.6 (1-1/8"), Front Derailleur Clamp: 31.8 (1-1/4"), Front Derailleur Cable Pull: Bottom Pull, Derailleur Capacity: 16, Front Derailleur Style: Traditional, Max Ring: 52, Double or Triple: Double, Drivetrain Speeds: 10, Front Der/Shifter Compatibility: Road,