For 1991 the venerable Shimano Skylark design was finally made SIS compatible. It was also made one further step cheaper. This example is made in Singapore and has noticeably cheap plating.

This example is a short cage version.

• Derailleur brands: Shimano
• Categories: Shimano - from Skylark to world domination
• Country: Japan, manufactured in Singapore
• Date of introduction: 1991
• Date of this example: 1994 (two letter code SK)
• Model no.: TY15 SS
• Weight: 305g including hanger plate
• Maximum cog: 28 teeth
• Total capacity: 28 teeth
• Pulley centre to centre: 56mm
• Index compatibility: 5 speed
• Chain width: 3/32”
• Logic: top normal
• B pivot: sprung
• P pivot: sprung
• Materials: steel