Cable routing for Shimano 105 rear derailleur? : r/bikewrench
Bike build help! Is this shimano 105 r7000 derailleur correctly attached to this hanger? The B link thing is confusing (Bike frame is vintage racer frame from early 90s) More details in
How to Size and Install Shift Cable Housing | Park Tool
Derailleur adjustment: How can I get my derailleur shifting smoothly again? - Mantel - Mantel - Mantel