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New 7 speed commuter with Shimano SIS index. No noise on stand, shifts smoothly but low clanking sound on road when pedaling in 4th & 5th though not other gears : r/bikewrench
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Amazon.com : MEGHNA Shimano Rear Derailleur 6/7 Speed RD-TZ31-A-GS Hanger Mount for Mountain Bike BMX : Sports & Outdoors
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SHIMANO SIS MTB Bicycle Bicycle Parts RD-TZ31/TY21 Bicycle Mountain Bike MTB 7/21 Speed Bicycle Rear Transmission Free Shipping - AliExpress
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