Groupsets

Components included within the Ultegra 6870 Di2 groupset are:
Ultegra chainset (50x34 or 52x36 - see buy options)
Ultegra front derailleur (braze-on)
Ultegra rear derailleur
Ultegra brake calipers (standard fit)
Ultegra STI levers
Ultegra cassette (

Chainset Features
Enhanced design saves 7g while maintaining rigidity
Iconic 4-arm construction maintains high rigidity and reduces weight
Optimised crank arm design strengthens key stress zones
New chainring tooth profile is adapted for race bike spe

Shimano Dura-Ace R9150 Di2 Groupset

Components included within this Shimano 5800 groupset are:
105 5800 brake caliper (standard set)
105 5800 compact (50-34T) or Semi-compact (52-36T) chainset (see buying options)
105 5800 front derailleur (braze-on)
105 5800 rear derailleur
105 5880 c