R8 front derailleurs are optimized for 7 and 8 speed chains and Shimano compatible road shifters. FEATURES: Cold forged aluminum body 31.8 adaptor included Chainstay angle: 63-66° Chain line: 45mm SPECS: Double or Triple: Triple Derailleur Capacity: 16 Front Der/Shifter Compatibility: Shimano Road Front Derailleur Style: Traditional Max Ring (teeth): 50 Front Derailleur Cable Pull: Bottom Pull Front Derailleur Clamp: 31.8 (1-1/4") , 34.9 (1-3/8") Drivetrain Speeds: 7 , 8 Weight: 110