You could not construct this derailleur more cheaply if you tried - but the underlying design is a SunTour V, with one sprung pivot, slant parallelogram and adjustment screws at the back.

I found this derailleur in a bike shop in Morocco, where it was considered a very special, premium, product amidst a sea of Xundah and Saiguan copies of the Shimano Tourney 15.

Like the Saiguan HG-08, you sneer at it at your peril.

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• Derailleur brands: Saiguan
• Country: China
• Date of introduction: 2003?
• Date of this example: 2006?
• Model no.: HG-05
• Weight: 267g including hanger plate
• Maximum cog: 28? teeth
• Total capacity: 28 teeth
• Pulley centre to centre: 56mm
• Index compatibility: 7 speed?
• Chain width: 3/32”
• Logic: top normal
• B pivot: unsprung
• P pivot: sprung
• Materials: mainly steel with a plastic front knuckle and inner cage plate.

Ref. 308