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 a fine piece of equipment, but Shimano had better chains, better sprockets, better marketing and a better reputation.

This is the short cage version, widely regarded as a beautiful, jewel-like item that signaled that its owner was one of the mountain bike cognoscenti. As with many of the most ‘beautiful’ models in this collection, this example is particularly battered. When I got hold of this derailleur it looked like it had been dredged up from the wreck of the Titanic by a star-struck lunatic in a midget submarine. It was completely encrusted in a substance that was half way between rust and sedimentary rock. Its threads were all seized and its various joints barely articulated. After a couple of days soaking in WD40 it rose from the dead, and is now a very rusty, but fully functional mechanism.


  1. Brand: SunTour

  2. My category: SunTour - the mountain bike gears

  3. Country: Japan

  4. Date of introduction: 1990?

  5. Date of this example: 1991 (two letter date code is HH)

  6. Model no: XP00-SSB

  7. Weight: 238g

  8. Maximum cog: 26 teeth (hanger 24mm) or 28 teeth (hanger 26mm or more) (Source: Sutherland’s 6th edition)

  9. Total capacity: 28 teeth (Sutherland’s 6th edition)

  10. Pulley centre to centre: 56.5mm

  11. Index compatibility: 7 speed?

  12. Chain width: 3/32”

  13. Logic: top normal

  14. Pivots: two sprung pivots

  15. Material: aluminium


SunTour XC Pro SS (XP00-SSB)