The revolutionary Dura-Ace Di2 electronic shifting option with SEIS (Shimano Electronic Intelligent System) takes the already superior Shimano shifting performance to a whole new level never seen before. The increased accuracy, smoothness and reliability of electronic shifting makes gear changes faster and virtually eliminates missed shifts.

The Di2 group is the fastest and most accurate shifting component group. Tenths or even hundredths of second determines whether you win or lose a race. Will Di2's electronic shifting give you an advantage? We think so.

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This group weighs in about 2160 grams. Group weight varies depending on cassette ratio, crankset length/ratio, etc.

Includes:

Rear Derailleur: Dura-Ace Di2 RD-7970 10 Speed Carbon

Front Derailleur: Dura-Ace Di2 FD-7970 Double

Brakeset: Dura-Ace BR-7900

Shifter/Brake Levers: Dura-Ace Di2 ST-7970 Carbon

Cassette: Dura-Ace CS-7900 Steel/Ti

Chain: Dura-Ace CN-7900

Crankset: Dura-Ace FC-7900 or FC-7950(Compact), Hollowtech II, Double

Bottom Bracket: Dura-Ace SM-BB7900

Complete set of Dura-Ace Cables, Housing and all Ferrules

All Electronics: Battery, Battery Charger, Power Cord, Rear Wire Kit, Front Wire Kit

Please indicate the size/type of these items in the comment box during check out

Front Derailleur Clamp: 28.6, 31.8, 34.9 or Braze-On

Bottom Bracket: English or Italian

Cassette: 11-21, 11-23, 11-25, 11-27, 11-28, 12-23, 12-25, 12-27

Crankset Ratio: 53/39 or 50/34

Crankset Lengths: 170mm, 172.5mm, 175mm

Wire Kit Lengths: Small for frames smaller than 52cm; Medium for frames between 52-56cm; Large for frames larger than 56cm.

For further information and details visit Dura-Ace Di2 page or feel free to call us.