Union GH-121 Rear Derailleur Hanger

The Union GH-121 derailleur hanger is the mounting piece that keeps the rear derailleur attached to the frame. It is used to replace a bent or broken part on Fuji, Marin and Jan Janssen bikes, after comparing the replacement with the original.

• Keeps the rear derailleur attached to the frame, made of aluminium, 56 mm long
• Mounts from the outside with 2 screws, without removing anything else
• Derailleur mounting thread with a 10 mm diameter and 1.00 pitch
• Suitable for Fuji, Marin and Jan Janssen; compare it with the original part
• To choose the right one, check the 13 mm mounting centre distance and the 40 mm distance to the derailleur hole

Technical specifications

• Product type: Rear derailleur hanger, model GH-121
• Frame holes: 2
• Material: Aluminium
• Colour: Chrome grey
• Total length: 56 mm
• Hanger mounting centre distance: 13 mm
• Centre distance between the upper mounting point and the derailleur hole: 40 mm
• Upper mounting thread: 4 mm diameter, 0.70 pitch
• Derailleur mounting thread: 10 mm diameter, 1.00 pitch
• Indicative compatibility: Fuji, Marin, Jan Janssen