microSHIFT Centos Front Derailleur 10-Speed Double, 28.6/31.8/34.9 Band Clamp, Compatible with Shimano CompatibleCentos front derailleurs are precisely manufactured for responsive, accurate shifting under race conditions. Product Specifics Drivetrain Speeds: 10 Weight: 119 Front Derailleur Style: Traditional Max Ring (teeth): 56 Double or Triple: Double Front Derailleur Clamp: 28. 6 (1 1 8") Front Derailleur Clamp: 31. 8 (1 1 4") Front Derailleur Clamp: 34. 9 (1 3 8") Front Der Shifter Compatibility: Compatible with Shimano Road Derailleur Capacity: 16 Front