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 China and uses noticeably thin steel and equally noticeably cheap plating.

This example is a long cage version.

• Derailleur brands: Shimano
• Categories: Shimano - from Skylark to world domination
• Country: Japan, manufactured in China
• Date of introduction: 1991
• Date of this example: 2000 (two letter code YK)
• Model no.: TY15 GS
• Weight: 327g including hanger plate
• Maximum cog: 28 teeth
• Total capacity: 34 teeth
• Pulley centre to centre: 75mm
• Index compatibility: 5 speed
• Chain width: 3/32”
• Logic: top normal
• B pivot: sprung
• P pivot: sprung
• Materials: steel