• Derailleur brands: Shimano
• Categories: Shimano - the Dura-Ace story
• Themes: Electric Avenue
• Country: Japan
• Date of introduction: 2016?
• Date of this example: 2016 (two letter date code OB)
• Model no.: 7970-A SS
• Weight: 216g
• Maximum cog: 28 teeth
• Total capacity: 33 teeth
• Pulley centre to centre: 56mm
• Index compatibility: 10 speed
• Chain width: 3/32”
• Logic: top normal
• B pivot: sprung
• P pivot: sprung
• Materials: carbon p-knuckle and pulley cage plates, aluminium b-knuckle and parallelogram plates

Ref. 1605