DISRAELI GEARS

SunTour X-1 Chroma GX yellow (CR01-GXB)

SunTour X-1 Chroma GX yellow (CR01-GXB) main image

The SunTour X-1 was a perfectly respectable mid-market mountain bike derailleur of the late 1980s. It had the geometry of the SunTour XC-Pro, but the pulley cage and inner parallelogram plate were steel, etc. etc. - so far, so utterly unexceptional.

In its basic condition the SunTour X-1 sported a rather stealthy all-black finish. You could even call it tasteful in a Dieter Rams sort of way. But then a bad taste bomb exploded on the mountain bike scene - and fluorescent colours were de riguer. I have no proof that Gary Fisher was personally responsible for this style holocaust - but his dress sense is certainly circumstantial evidence.

How did component manufacturers react to this provocation? Shimano studiously ignored it, Campagnolo was unresponsive and in a coma and SunTour produced the X-1 Chroma - an X-1 with a bizarre clip-on plastic piece that came in a choice of lurid colours.

There were six 'Chroma' models in all, two different basic models, an earlier and a later model, each available with one of three clip-ons. The three clip-ons were rendered in fluorescent pink, fluorescent yellow or fluorescent lime green. The earlier basic model (CR00-GXB) had a tendency to flat surfaces and had 'X-1' written to the left of 'SunTour' on its outer parallelogram plate. The later basic model (CR01-GXB) had more fulsomely curved surfaces and 'SunTour' written to the left of 'X-1' on its outer parallelogram plate. Because of the different shape of, and different writing on, the outer parallelogram plates, the plastic clip-ons are also different for each model.

Handily, the Chroma clip-on clipped off as easily as it clipped on, and, if you didn’t remove it yourself (wearing sunglasses for safety reasons), it soon broke off of its own accord. Be thankful for small mercies.


This is a, rather decent, unused, example of the later CR01-GXB, with a yellow clip-on. However you should note that the yellow clip-on is already just about to break and fall off!


  • Derailleur brands: SunTour
  • Categories: SunTour - the mountain bike gears
  • Themes: A riot of colour
  • Country: Japan
  • Date of introduction: 1990?
  • Date of this example: 1992 (two letter date code is ID)
  • Model no.: CR00-GXB
  • Weight: 312g
  • Maximum cog: 32 teeth (source: SunTour)
  • Total capacity: 39 teeth (source: SunTour)
  • 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 steel pulley cage plates and steel inner parallelogram plate
SunTour X-1 Chroma GX yellow (CR01-GXB) additional image 01
SunTour X-1 Chroma GX yellow (CR01-GXB) additional image 02
SunTour X-1 Chroma GX yellow (CR01-GXB) additional image 03
SunTour X-1 Chroma GX yellow (CR01-GXB) additional image 04
SunTour X-1 Chroma GX yellow (CR01-GXB) additional image 05
SunTour X-1 Chroma GX yellow (CR01-GXB) additional image 06
SunTour X-1 Chroma GX yellow (CR01-GXB) additional image 07
SunTour X-1 Chroma GX yellow (CR01-GXB) additional image 08
SunTour X-1 Chroma GX yellow (CR01-GXB) additional image 09
SunTour X-1 Chroma GX yellow (CR01-GXB) additional image 10
SunTour X-1 Chroma GX yellow (CR01-GXB) additional image 11
SunTour X-1 Chroma GX yellow (CR01-GXB) additional image 12
SunTour X-1 Chroma GX yellow (CR01-GXB) additional image 13
SunTour X-1 Chroma GX yellow (CR01-GXB) additional image 14
SunTour X-1 Chroma GX yellow (CR01-GXB) additional image 15
SunTour X-1 Chroma GX yellow (CR01-GXB) additional image 16
SunTour X-1 Chroma GX yellow (CR01-GXB) additional image 17
SunTour X-1 Chroma GX yellow (CR01-GXB) additional image 18
SunTour X-1 Chroma GX yellow (CR01-GXB) additional image 19
SunTour X-1 Chroma GX yellow (CR01-GXB) additional image 20

Browse associated documents.




SunTour Bicycle Equipment Catalog 1991

SunTour Bicycle Equipment Catalog 1991

  • Publisher: SunTour
  • Date: 1990
  • Derailleur brands: SunTour, Browning
  • Derailleurs: too numerous to mention - please see the individual pages
SunTour Bicycle Equipment Catalog 1991 - Front cover thumbnail