Rear derailleur Shimano RD-M3020 Acera Black
Compatible with 7 or 8-speed rear cassettes/freewheels
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Compatible with 7 and 8 speed rear sprockets
Suitable chain: HG 8/7/6 gears
Front sprocket block: 20T - 45T
Rear sprocket block: 11T - 12T/30T - 40T
Aluminium/steel