DISRAELI GEARS

Shimano Light Action (L525 SS)

Shimano Light Action derailleur (L525 SS) main image

Shimano’s Light Action design involved mounting the cable clamp bolt on a short lever that was independantly sprung, allowing some ‘give’ before the parallelogram was shifted. It was the direct descendant of the ‘cable saver’ on the Shimano Lark and Eagle designs.

I liked it a lot. Combined with well made, affordable, slant parallelogram derailleurs it gave a slick, fluid shift - tangibly nicer than SunTour’s comparably priced offerings of the time.

This example is a short cage version of the best of the Light Action range - with a satin finish aluminium outer parallelogram plate.


  • Derailleur brands: Shimano
  • Categories: Shimano - weirdness
  • Country: Japan
  • Date of introduction: 1986
  • Date of this example: 1986 (two letter date code is KD)
  • Model no.: L525
  • Weight: 264g
  • Maximum cog: 28 teeth (Sutherland’s 6th edition)
  • Total capacity: 28 teeth (Sutherland’s 6th edition)
  • Pulley centre to centre: 55mm
  • Index compatibility: 6 speed (Sutherland’s 6th edition says the SS version is SIS compatible)
  • Chain width: 3/32”
  • Logic: top normal
  • B pivot: sprung
  • P pivot: sprung
  • Materials: aluminium knuckles and outer parallelogram plate, steel pulley cage and inner parallelogram plate.

Browse associated documents.




Complete Line of Shimano System Components (01/1986)

Complete Line of Shimano System Components (01/1986)

  • Publisher: Shimano
  • Date: January 1986
  • Derailleur brands: Shimano
  • Derailleurs: too numerous to mention - see individual pages
Complete Line of Shimano System Components (January 1986) scan 01 thumbnail


Shimano Bicycle System Components (12/1986) scan 25 of 28

Shimano Bicycle System Components (12/1986) scan 25 of 28

Shimano Bicycle System Components (1987) scan 25 thumbnail


Shimano Spare Parts Catalogue - 1986

Shimano Spare Parts Catalogue - 1986

  • Publisher: Shimano
  • Date: 1986
  • Derailleur brands: Shimano
  • Derailleurs: too many to list here!
Shimano Bicycle Parts - 1986 scan 01 thumbnail