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Amazon.com : SHIMANO CS-HG50 Sora Bicycle Cassette (8-Speed, 12/25T, Silver) : Bike Cassettes And Freewheels : Sports & Outdoors
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Amazon.com: SENSAH STI Road Bike Shifters Double 2×9 Speed Lever Brake Bicycle Derailleur Groupset Compatible for Shimano Sora 9 Speed Shifter(2*9 Lever) : Sports & Outdoors
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