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Amazon.com : JGbike Compatible 10 Speed MTB 4pc groupset for Shimano Deore M4100: Right Shift Lever SL-M4100-R,Long cage Rear Derailleur “RD-M4120-SGS“, Sunrace CSMX3 11-42T Black Cassette, KMC X10 Chain : Sports &
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Amazon.com : Shimano Deore XT CS-M770 9-Speed Cassette - 11x34 : Bike Cassettes And Freewheels : Sports & Outdoors
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Amazon.com : Hycline Shimano 7 Speed Bike Cassette CS-HG200 Bike Sprocket,12-32 Teeth : Sports & Outdoors
![Rear derailleur Shimano STX is just working 3rd or 4th cassette. Shifter is working right. Any idea of what the problem can be & how to fix it? : r/bikewrench Rear derailleur Shimano STX is just working 3rd or 4th cassette. Shifter is working right. Any idea of what the problem can be & how to fix it? : r/bikewrench](https://preview.redd.it/rear-derailleur-shimano-stx-is-just-working-3rd-or-4th-v0-ovsmgzttp2fa1.jpg?width=640&crop=smart&auto=webp&s=1de9e752b20ac5def878a627d061fabf3221d1cf)