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The wide pivot link design boosts strength and rigidity. Flex is suppressed, creating sharp, precise shifts that are faster and smoother, even from low to high gears off of the saddle.

Technical Documents
EV-FD-6600_6603-2349EV-FD-6600_6603-2349
Features
  • Wide link design:20% increased rigidity.
  • Pivot locations for less cage deflection:Pivot location at cage was moved to point of maximum force to reduce cage deflection.
  • Narrower chain cage:Narrower chain cage to accommodate 10-speed chain.
  • SG-X chainrings compatibility
  • Light action spring
  • DUAL SIS front index shifting
  • Weight: 103g
Specifications
Model NumberFD-6600-B
SeriesULTEGRA
Cassette Compatibility10-speed
Top Gear Teeth50-56T
Maximum Capacity16T
Link Bushinglower A-pin
Spring Coveryes
Chain Stay Angle61-66
Mountingband
Chain Line43.5mm
Band Mount28.6/31.8/34.9mm
Band Materialaluminum/clear coated
Outer Linkaluminum/clear coated
Inner Linkaluminum/clear coated
Chain Guidesteel/pearl bright finish
Average Weight89g (FD-6600-F)