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Double Servo rear derailleur with smooth, precise shifting performance and wide-range capability. The SHIMANO ACERA M3020-8 rear derailleur with Double Servo technology helps you ride challenging terrain with fewer interruptions. Double Servo construction for smooth and precise shifting Versatile performance and wide compatibility Compatible with 7-speed and 8-speed rear cassettes/freewheels Compatible chain: HG 8/7/6-speed Top-Normal spring type: Double servo Mount: Direct attachment (Conventional) Long derailleur cage (SGS) Cable adjuster Max. front difference: 20T Total capacity: 45T Low sprocket Max.: 40T Low sprocket Min.: 30T Top sprocket Max.: 12T Top sprocket Min.: 11T Fluoric coated link bushings: 1 Pulley Teeth: 11T Sunken type pulley bolt Material: Aluminum/Steel DOUBEL SERVO: SHIMANOs double servo-panta mechanism enables the rear derailleur to move in an optimum path. The guide pulley tracks the cogs closely while moving front to back, optimizing each shift. Perfect tracking contributes to the most accurate SIS shifting. Keeps rear derailleur guide pulley an optimum distance from each sprocket. |