Cannondale CAAD 8 X 12 Contro Quick Slice Mech Derailleur CNC Gear Hanger KP255 796017711731 | eBay
How to Install a Rear Derailleur - YouTube
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