R8 front derailleurs are optimized for 7 and 8 speed chains and compatible road shifters. Cold forged aluminum body. Chainstay angle: 61-66°. Chain line: 43.5mm. Item Specifications: Drivetrain Speeds: 7,8, Double or Triple: Double, Derailleur Capacity: 16, Front Der/Shifter Compatibility: Road, Front Derailleur Cable Pull: Bottom Pull, Front Derailleur Clamp: 28.6 (1-1/8"),31.8 (1-1/4"),34.9 (1-3/8"), Front Derailleur Style: Traditional, Max Ring (teeth): 52,