microSHIFT R8 Front Derailleur 7/8-Speed Double, 52T Max, 31.8/34.9 Band Clamp, Compatible with Shimano CompatibleR8 front derailleurs are optimized for 7 and 8 speed chains and Compatible with Shimano compatible road shifters. Product Specifics Drivetrain Speeds: 7 Drivetrain Speeds: 8 Weight: 110 Front Derailleur Style: Traditional Max Ring (teeth): 53 Double or Triple: Double 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 Derailleur Cable