Shimano Acera M3020 Sgs Rear Derailleur Black 8s / Max 34t

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.Features:- Double Servo construction for smooth and precise shifting- Versatile performance and wide compatibility- Max. low sprocket: 40T- Total capacity: 45TProduct Specifications:- SERIES: ACERA M3000 Series- Compatible chain: HG 8/7/6-speed- Total capacity: 45T- Cable adjuster: Yes- Mount_Direct attachment (Conventional): Yes- Fluoric coated link bushings: 1- Low sprocket_Max: 40T- Low sprocket_Min: 30T- Max. front difference: 20T- Pulley_Sunken type pulley bolt: Yes- Pulley_Teeth: 11T- Pulley cage: SGS- Top-Normal spring type_Double servo: Yes- Top sprocket_Max: 12T- Top sprocket_Min: 11T- Rear speeds: 8/7Technologies:Double Servo:- SHIMANO's double servo-panta mechanism enables the rear derailleur to move in an optimum path. The guide pulley tracks the cog