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As an addition to the mechanical Dura-Ace 7900 series, the electronic Dura-Ace 7970 will deliver state-of-the-art technology that will give its users a revolutionary road riding experience. Di2 stands for ’Digital…
As an addition to the mechanical Dura-Ace 7900 series, the electronic Dura-Ace 7970 will deliver state-of-the-art technology that will give its users a revolutionary road riding experience. Di2 stands for ‘Digital Integrated Intelligence’. This innovative shift technology is still based on the Shimano Index System (SIS) that has proved its superior gear changing characteristics over the years. The big difference is that in this case , the shifting action is provided for by electronics instead of mechanics. This electronic shifting system was tested extensively over the past two years by several professional riders in all conditions possible, such as rain, mud, low temperatures, cobble stone roads and combinations of all of these at the same time. Dura-Ace 7970 series consists of Dual Control Levers, front and rear derailleur’s and a battery kit combined with remaining 7900 mechanical components. The Shimano 7970 Dura-Ace Di2 Rear Derailleur is part of the 7970 range.
Digital Integrated Intelligence or Di2: with programmed automatic motion at the touch of a switch the Dura-Ace Di2 rear derailleur is quick, smooth and effortless, making for unmatched drivetrain efficiency. The removal of traditional mechanical cables in favour of electrical wires not only eliminates poor shifting caused by contaminates, corrosion and stretching, but provides effortless gear shifts. Derailleur contains a saver (fuse) function, where the inner structure is protected from strong impacts. 11-27T wide gear ratio capacity will cater for compact setups as well as the traditional road double. Full carbon fibre inner and outer pulley plates enhance rigidity and reduce weight. High tolerance cold forged aluminium link plates and body construction is extremely light and durable. Four self-lubricating micro-machined fluorine-coated link pivot bushings provide low-friction shifting. Pulleys are made of tough DuPont Zytel for longer life and less chain noise.
Cold forged aluminium link plates and body construction
Full carbon fibre inner and outer pulley plates
- Jockey Wheels:
DuPont Zytel for longer life and less chain noise
Fluorine-coated link pivot bushings provide low-friction shifting
10-speed Dura-Ace Di2 compatible
Titanium B axle bolt for further weight savings
A buying guide that offers general advice on derailleurs
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