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Amazon.com : Shimano RDM310DL Altus GS 7/8-speed Rear Der Black,Long Cage : Rear Bike Derailleurs : Sports & Outdoors
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SHIMANO Altus SL-M310 3x8 3x7 21 24 Speed Shifter Trigger Set Rapidfir – Emporium Park
Amazon.com : Shimano RDM310DL Altus GS 7/8-speed Rear Der Black,Long Cage : Rear Bike Derailleurs : Sports & Outdoors
Altus Rear derailleur offering Crisp Performance on- and Off-Road for 9-Speed drivetrains. Wide Link Design Increases Design and Service Life. 11-Tooth Pulleys for Reduced Pulley wear and Chain