Shimano Acera RD-M3020-8 SGS Long Cage Rear Derailleur for 7/8 Speed Size_16 Shimano has used both types

Shimano has used both types

SUPERLIGHT AND RESPONSIVE

no need to be afraid of wind and rain

grip and puncture protection

Great retention capabilities

Shimano Acera RD-M3020-8 SGS Long Cage Rear Derailleur for 7/8 Speed Size_16 Shimano has used both typesSHIMANO ACERA Rear Derailleur 8 speed RD M3020 8 NEW 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: 45T PRODUCT