SunTour XC Pro GX (XP00-GXB)

SunTour XC Pro GX derailleur (XP00-GXB) main image

With the XC Pro groupset SunTour tried to take the fight to Shimano by claiming the high ground above Deore XT. This derailleur is very well made, with a high gloss finish, sealed bearing pulley wheels and a solid business-like feel. As was de rigeur at the time, it has two sprung pivots and a slant parallelogram. It was an impressive piece of equipment, but Shimano had better chains, better sprockets, better marketing and a better reputation.

This is the longest cage version of the three.

  • Derailleur brands: SunTour, manufactured after 1993 by SR SUNTOUR
  • Categories: SunTour - the mountain bike gears
  • Country: Japan
  • Date of introduction: 1990? (instructions printed in 1990)
  • Date of this example: 1991 (two letter date code is HJ)
  • Model no.: XP00-GXB
  • Weight: 278g
  • Maximum cog: 28 teeth (hanger 24mm), 30 teeth (hanger 26mm) or 32 teeth (hanger 28mm or more) (Source: Sutherland’s 6th edition)
  • Total capacity: 40 teeth (Sutherland’s 6th edition)
  • Pulley centre to centre: 85mm
  • Index compatibility: 7 speed?
  • Chain width: 3/32”
  • Logic: top normal
  • B pivot: sprung
  • P pivot: sprung
  • Materials: largely aluminium with a steel inner pulley cage plate