This is a sorry item. A pale, Taiwanese-made, reflection of the once glorious, Japanese-manufactured, SunTour XC Pro GX.

If you look at the accompanying photos, you can see that the inner parallelogram pivot pin is poorly mounted in the b-knuckle. Interestingly, page 3 of the SR SUNTOUR 1997 catalogue inadvertently shows a SunTour Giga 450 derailleur with a problem with exactly this pivot pin.

• Derailleur brands: SunTour, although by this time it was a brand of SR SUNTOUR
• Country: Taiwan
• Date of introduction: 1995?
• Date of this example: unknown
• Model no.: AP35-GXB?
• Weight: 278g
• Maximum cog: 28 teeth (source: SR SUNTOUR)
• Total capacity: 39 teeth (source: SR SUNTOUR)
• Pulley centre to centre: 85mm
• Index compatibility: 8 speed
• Chain width: 3/32”
• Logic: top normal
• B pivot: unsprung
• P pivot: sprung
• Materials: aluminium knuckles with steel parallelogram plates and pulley cage plates