SHIMANO FD-4503 Tiagra Front Derailleur (3x9-Speed, 28.6/31.8mm, Silver) Capacity: 20T, Chain Compatibility: 9-Speed, Clamp: 28.6/31.8 millimeter, Crank/FD Type: Road Triple, Derailleur Color: Silver FD/Shifter Compatibility: Shimano Road Triple, Front Derailleur Cable Pull: Bottom, Front Derailleur Clamp: 28.6 millimeter (1-1/8"),31.8mm (1-1/4") Front Derailleur Clamp: 31.8 millimeter (1-1/4-Inch),28.6 millimeter (1-1/8-Inch) Front Derailleur Style: Traditional, Max Ring: 53teeth, Rings: triple, Speeds: 9sp