• Derailleur brands: Vision
• Themes: Ultra-lightweight - road racing models
• Country: Taiwan
• Date of introduction: 2014?
• Date of this example: 2014? (coded 2214, which may mean week 22 of 2014)
• Model no.: VT801
• Weight: 176g
• Maximum cog: 25 teeth (source: Vision, although they claim that the nearly identical VT800 can accept a 28T sprocket)
• Total capacity: unknown
• Pulley centre to centre: 62mm
• Index compatibility: 11 speed
• Chain width: 3/32”
• Logic: top normal
• B pivot: sprung
• P pivot: sprung
• Materials: Mainly carbon, with an aluminium b-knuckle and inner pulley cage plate.

Ref. 1663