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
Amazon.com : ENBO Shimano Bike Rear Derailleur RD-TX800 7/8 Speed Direct Mount for Mountain Bicycle (Black) : Sports & Outdoors
Shimano SIS Rear derailleur fixing problem - Bicycles Stack Exchange