Origin	Shimano - Japan
Model Number	Di2 7970

New Arrival in 2009 Sell Dura-Ace Di2 7970 Electronic Groupset from  Shimano

STI Dual Control levers (ST-7970) C 255g/pair

Although the entire 7970 package is heavier than the standard 7900, the STI Dual Control levers themselves will shed over 155g, meaning the additional weight is at least located down low and the bike might actually feel a bit lighter when swinging side-to-side. Button placement is analogous to mechanical units so shifting should be intuitive for current Shimano users.

As with the new 7900, the 7970 levers will also have a reach adjustment and will be compatible with the new FlightDeck computer (SC-7900).

Derailleurs (RD-7970 & FD-7970) C 225g & 124g

Save for the replacement of a spring with a servo motor, the Di2 rear derailleur will share many of the mechanical versions changes such as the carbon fibre pulley cage and 27T cog compatibility. A built-in mechanism protects the servo motor in the event of a crash, too, and the system supposedly recalibrates itself afterwards

Battery (SM-BT79) C 68g

Dura-Ace Di2 uses a compact 7.4V Li-ion battery that will last for approximately 1000k (621mi) of heavy use and will recharge in just 1.5 hours. Extensive testing has also reportedly shown excellent sealing and reliability in challenging conditions.

Time Trial & Triathlon (ST-7971 & SW-7971) C weights TBD

Shimano will also introduce a Dual Control lever that is bar-end mounted for use with time trial and triathlon setups although it wont be available until some time after the rest of groupset is introduced. Like the standard drop bar-mounted levers, the TT/Tri version will also be reach-adjustable and compatible with the new coded wireless FlightDeck computer.

Group Set include:
* STI Dual Control levers
* Rear derailleur
* Front derailleur
* Cable set
* Battery
* Charger
* Chainset (Dura Ace FC7900)
* Cassette

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