SMOOTHLY SHIFT FROM GEAR TO GEAR WITH THE HELP OF THE SHIMANO ALTUS 7/8 SPEED MOUNTAIN BICYCLE FRONT DERAILLEUR.The Shimano Altus 7/8 Speed Mountain Bicycle Front Derailleur sees to it that the chain seamlessly moves from one sprocket to next. The aluminum body is designed to remain sturdy and free of corrosion. FEATURESDual PullDerailleur Capacity: 20Front Der/Shifter Compatibility: Shimano MountainFront Derailleur Clamp: 28.6mm (1-1/8) , 31.8mm (1-1/4) , 34.9mm (1-3/8)Front Derailleur Style: TraditionalMax Ring (teeth): 48