Shimano Acera RD-M3020 Rear Derailleur 7/8 Speed Long Cage Direct AttachmentThe Shimano Acera RD-M3020 Rear Derailleur features Double Servo technology to provide smooth, precise shifting and helps you ride challenging terrain with fewer interruptions. This long cage rear derailleur mounts directly and works on 7 and 8 speed Shimano mountain setups with cassettes between 30T and 40T. Available in Black.192790897738
