Comprised of Dual Control type shift / brake levers, front derailleur, rear derailleur, and a battery pack, the new Dura-Ace Di2 7970 components provide precision electronic performance and integrate seamlessly with components from the 7900 series Dura-Ace group while adding only 68 grams to the entire group.
Electrically actuated shifting significantly eliminates issues associated with cable friction and contamination because the derailleurs respond to electrical impulses that are delivered in fractions of a second. The shifters are now merely switches which also allows for creative placement of optional remote shifters while also reducing the weight and profile of the main shift units. Derailleur movement is precisely controlled through computer automated movement and servo motors creating perfectly synchronized and calibrated shifts every time.
ST-7970 Dura-Ace Di2 Dual Control Levers
By using unidirectional carbon fiber brake lever blades and eliminating all of the mechanical shifter parts, the new Dual Control lever weight is reduced by over 155g over the mechanical version. The ergonomics are slimmed down and further refined for a comfortable grip.
The wiring harness for the shifters is designed to accept the all new FlightDeck computer (SC-7900) featuring heart rate, altitude, grade, cadence, estimated caloric consumption, gear position, and battery life all directly downloadable data via a wireless connection.
RD-7970 Dura-Ace Di2 Rear Derailleur
Like the 7900 mechanical derailleur, the 7970 has a new carbon fiber rear pulley cage and the new design is compatible with wider range cogsets, accommodating up to a 27 tooth cog. The differences are the fact that the unit is now driven by a servo motor instead of a cable and spring, so shifts are identical and precise every time as the computer control unit analyzes each shift.
The derailleur has a built in mechanism that will allow the body to move inward under impact to reduce the potential for damage in the case of a crash. Cycling through the shifting a couple of times allows the shifter and rear derailleur to automatically re-synchronize.
FD-7970 Dura-Ace Di2 Front Derailleur
The front derailleur is the “brains” of the system. The integrated ultra-compact CPU not only ensures that shifting is perfect for both the front and rear derailleurs individually, but also by monitoring the position of each, creates a front derailleur that tracks the chain and requires zero manual trim without sacrificing any shifting speed. The front derailleur logic also performs the inward shift from the big chainring in two parts to eliminate chain drop, with both actions measured in fractions of a second.
SM-BTR1 Dura-Ace Di2 Battery Pack
The 7.4V, high performance Lithium Ion battery is designed to deliver reliable, long life even in the worst conditions. In conditions requiring consistent and frequent shifting, the battery is capable of 1000 kilometers of use.
The battery is rechargeable and comes with a mount that easily adapts to most bikes. Lithium Ion technology is lighter, more compact and better performing than other power sources, making it a clear choice for Di2.
Shimano Dura-Ace 7970 Di2 Groupset Includes:
Shimano Dura-Ace ST-7970 Di2 Dual Control Levers
Shimano Dura-Ace RD-7970 Di2 Rear Derailleur
Shimano Dura-Ace FD-7970 Di2 Front Derailleur
Shimano Dura-Ace SM-BTR1 Di2 Battery Pack
Shimano Dura-Ace 7970 Wiring Kits
Shimano Dura-Ace FC-7900 Crankset
Shimano Dura-Ace BR-7900 Brakes
Shimano Dura-Ace CN-7900 Chain
Shimano Dura-Ace BB-7900 Bottom Bracket
Shimano Dura-Ace CS-7900 Cassette |
A legend sharpened to a new level of perfection. Providing the ideal symbiosis of lightweight, stiffness and performance. And finally out there to set new standards in professional cycling.
The Shimano Dura-Ace 7900 series sets a new benchmark in top-level road racing components. Shimano has combined
all its engineering resources with the latest technology to realize an increasing level of perfection that will
benefit professional riders as well as many road-racing enthusiasts.
Shimano Dura-Ace 7900 8 Piece Groupset Includes:
Shimano Dura-Ace FC-7900 Crankset
Shimano Dura-Ace BR-7900 Brakes
Shimano Dura-Ace ST-7900 Dual Control Levers
Shimano Dura-Ace FD-7900 Front Derailleur
Shimano Dura-Ace RD-7900 Rear Derailleur
Shimano Dura-Ace CN-7900 Chain
Shimano Dura-Ace BB-7900 Bottom Bracket
Shimano Dura-Ace CS-7900 Cassette |
ABOUT Di2
For the past four years, professional riders have been riding Shimano Dura-Ace components with Di2 electronic shifting technology over the highest mountains, the worst cobbles and through the most extreme weather conditions imaginable. As of this year, Shimano Ultegra will also be fitted out with this groundbreaking technology.
What are its characteristics? Just the same as for Dura-Ace. Changing gears becomes easier, effortless and faster by simply touching the shift buttons. Control at your fingertips. Additional benefits include an automatic trimming front derailleur, great accuracy plus easy adjustment and installation. Di2 continues its great success with Shimano Ultegra. And it makes no difference if these roads are cobbles, tarmac or mud.
ADVANCED TECHNOLOGY
Of course, to make a difference, you have to be in top shape yourself. However, Shimano Ultegra Di2 components give you the edge over your competition. Advanced 3D design and extensive testing have allowed us to find the perfect balance between shifting speed, ergonomics, strength, weight and rigidity. With just a flick of the finger, Di2 technology enables faster, precise and multi-precision shifting plus automatic trimming. |
Ultegra has long been recognized as a solid performer and thanks to Shimano’s Systems Engineering approach the 6700 series continues to deliver. Lighter, more stylish and advanced by the latest Dura-Ace technologies, new Ultegra is a beautifully balanced group with optimal performance and specifications. Its unprecedented racing DNA takes shifting and braking to another level, with a with a weight reduction of 150g versus 6600 series.
Shimano Ultegra 6700-G 8 Piece Groupset Includes:
Shimano Ultegra FC-6700-G / 6750-G Crankset
Shimano Ultegra BR-6700-G Brakes
Shimano Ultegra ST-6700 Dual Control Levers
Shimano Ultegra FD-6700-G Front Derailleur
Shimano Ultegra RD-6700-G Rear Derailleur
Shimano Ultegra CN-6700 Chain
Shimano Ultegra BB-6700 Bottom Bracket
Shimano Ultegra CS-6700 Cassette |