Optimized for Shimano compatible 9-speed road drivetrains, R9 front derailleurs feature metal construction and rapid shifting response. Features: Designed for use with 30/39/50t chainrings Cold forged aluminum body 31.8 adaptor included Chainstay angle: 63-66deg Chain line: 45mm Specs: Drivetrain Speeds 9 Double or Triple Triple Derailleur Capacity 20 Front Der/Shifter Compatibility Shimano Road Front Derailleur Cable Pull Bottom Pull Front Derailleur Clamp 34.9mm (31.8 (1-1/4") Adapter Included) Front Derailleur Style Traditional Max Ring (teeth) 50