SunTour Le Tech (5900)

SunTour Le Tech derailleur (5900) main image

I think that the SunTour Le Tech was SunTour’s second foray into the world of three pivot derailleurs (the Trimec (6400?) being the first) - and the Le Tech is a blinder - I particularly like the oh-so-modern ‘computer’ type face.

I remember the Le Tech being presented as a pure touring gear - SunTour’s response to the 1981 Shimano Deore. It was Cyclone quality and combined SunTour’s slant parallelogram with the joys of a three pivot design. It gave a very small and consistent chain gap and a lightening quick and pin-point accurate gear change.

With the gift of hindsight, its most surprising feature is that it had a conventional guide pulley that you could remove and replace. I never knew why SunTour ditched this design and adopted the fatally flawed Trimec configuration for the first MounTech models.

However 1982 was not the time to launch a radical touring derailleur - the tidal wave of mountain bike hysteria was just crashing onto the shores of the bicycle world and the Le Tech got washed away in the turbulence.

A forgotten work of (fragile) genius.

  • Derailleur brands: SunTour
  • Categories: SunTour - Frank Berto and the curse of Duopar
  • Country: Japan
  • Date of introduction: 1982?
  • Date of this example: 1983 (two letter date code is ZL)
  • Model no.: 5900
  • Weight: 308g
  • Maximum cog: 34 teeth?
  • Total capacity: 40 teeth?
  • Pulley centre to centre: 80mm
  • Index compatibility: friction
  • Chain width: 3/32”
  • Logic: top normal
  • B pivot: unsprung
  • P pivot: two, both sprung
  • Materials: largely aluminium with steel pulley cage plates, link element plate and inner parallelogram plate

Browse associated documents.

Ron Kitching Everything Cycling - 1984

Ron Kitching Everything Cycling - 1984

Ron Kitching Everything Cycling - 1984 front cover thumbnail