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I'm on Amazon now looking for a Shimano derailleur to replace the one that is on there now to rebuild a bike that I got for free. Please help me find the right one.

Amazon.com : shimano derailleur hybrid bike 21 speed

www.amazon.com

 

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P.S. I'm looking at this cassette to go with it. What say you? Thanks!

Amazon.com : SHIMANO Cassette Sprocket, Cs-Hg50 8-S, Ni-Plated, 11-13-15-18-21 : Sports & Outdoors

Amazon.com : SHIMANO Cassette Sprocket, Cs-Hg50 8-S, Ni-Plated, 11-13-15-18-21 : Sports & Outdoors

www.amazon.com