I have 1x9 drivetrain setup on my Giant Seek.
Components were Superstar XCR chaing guide, Deore derailleur long cage, SS FSA chainring.
Few days ago I put Sram X7 medium cage derailleur and the rest of the setup is same but chain keeps falling off
Chain length is OK, new derailleur is not bend, everything seems to be ok but it's not...
Old setup (no problems with chain, never!)