Shimano RD-M3020-8 Rear Derailleur Acera 7/8-Speed Black (not for 11-28T) Ships within Australia In stock. Available via Click and Collect or Buy Online Share Loading Facebook Like button... Shimano RD-M3020-8 Rear Derailleur Acera 7/8-Speed Black (not for 11-28T) Ships within Australia In stock. Available via Click and Collect or Buy Online Share Loading Facebook Like button...