Shimano Lark-W (1st style)

Shimano Lark-W derailleur (1st style) main image

I think that the Lark name was first used on this derailleur - the 1967 Shimano Lark-W. The W designation indicates that the derailleur has no spring in the parallelogram and is controlled by two cables, pulling in opposite directions, worked by a twist-grip. Like the Shimano Archery-W and unlike later Shimano Lark-W’s, the cable nipples in this model are at the twist grip, and the clamp bolts are on the derailleur.

Aside from the W system, this is a very similar derailleur to the 1967 Shimano Skylark, except that the adjustment screws have been moved to the other side of the outer parallelogram plate - to make way for the twin cables.

This is an early example with aluminium (?) nameplate and the screw stop for the pulley cage.

  • Derailleur brands: Shimano
  • Categories: Shimano - from Skylark to world domination, Shimano - Positron indexing insanity
  • Country: Japan
  • Date of introduction: 1967
  • Date of this example: unknown (no two letter date code, ‘3.3.3.’ marking on pulleys)
  • Model no.: unknown
  • Weight: 353g including hanger plate but excluding drop-out bolt
  • Maximum cog: 28 teeth
  • Total capacity: 28 teeth
  • Pulley centre to centre: 54mm
  • Index compatibility: friction
  • Chain width: 3/32”
  • Logic: operated by two cables with no ‘normal’ position
  • B pivot: sprung
  • P pivot: sprung
  • Materials: steel