Shimano Ultegra FD-6870-F Front Derailleur / Front Mech

Specifications

• Model no.
  FD-6870-F
• Brand
  Shimano
• Series
  Ultegra
• Groupset
  Ultegra 6800
• Tier
  Enthusiast
• Intended use
  Road
• Weight (claimed average)
  155 g

  This is the manufacturer’s claimed average weight; actual weights may differ.

• Shifting type
  Di2

  Gear shifting can be mechanical or electronic. Mechanical systems use cables to move derailleurs, while electronic ones rely on battery-powered motors. Wired electronic setups connect shifters and derailleurs with wires; semi-wireless systems use wireless links from shifter to junction box, then wires to the derailleur; fully wireless systems link shifter and derailleur directly.

• Front speeds
  2

  Number of chainrings on the crankset.

• Rear speeds
  11

  Number of cogs on the cassette.

• Max front diff
  16 teeth

  The max front diff is the largest tooth count gap between chainrings a rear derailleur can manage. A greater difference requires a longer rear derailleur cage to handle extra chain slack. On a single chainring system, the difference will be 0.

• Top gear teeth
  46-53 teeth

  The number of teeth on the largest chainring that the front derailleur can accommodate.

• Chainline
  43.5 mm

  Chainline refers to the distance between the centreline of the frame and the centreline of the chainrings.

• Chain stay angle
  61-66 deg.

  Front derailleurs are engineered to work within specific chain stay angle ranges. Consult the frame geometry chart to ensure that the front derailleur is an appropriate fit.

• Mount
  Braze-on

  This is the method for attaching the front derailleur to the bike frame. Front Derailleurs come in versions for different mount types; confirm your frame’s compatibility.