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Shimano Dura Ace Di2 7970 10 Speed Rear Derailleur
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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.
Programmed automatic motion at the touch of a switch makes this derailleur quick, smooth and effortless to shift.
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.
For details on how to install Shimano's Di2 drivetrain please view their Di2 Installation guide
Various derailleur systems were designed and built as far back as the late 1800s. A French bicycle tourist, writer and cycling promoter Paul De Vivie (1853-1930), invented a two speed rear derailleur in 1905 which he used on forays into the Alps, and we wonder if 20 gears are enough..... Since then there have been many advancements, in the number of gears, materials and reductions in weight. Wiggle lists a large selection of front and rear derailleurs catering for double and triple systems with 7, 8, 9, 10 and even 11 speed cassettes.
Shimano are the makers of the world's most well known cycle component brand. Established in 1921 when the first cycle freewheel was forged. Shimano produce drivetrains, wheels, pedals, shoes, cycling clothing and pretty much every Shimano cycle accessory you can think of! Famous for their top end products ridden by the pro's, Dura-Ace and XTR, which cover both road and MTB's. At Shimano, they're doing everything they can to respond to heightened environmental concerns. Shimano are proud to be a producer of bicycle components that help people to enjoy outdoor sports and interact with nature through healthy non-polluting activities. In their 87 plus years of existence Shimano have accumulated a wealth of technology and product development and expertise that serves as the driving force behind their continually evolving product line.
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"A solution to a problem that doesn't exist." "Unnecessary." "A marketing gimmick." Those are lines offered time and again by armchair critics of Shimano's new Dura-Ace Di2 electronic drivetrain, yet few of those pundits have spent any time on the stuff. After our initial sampling last summer in Japan and now two solid months of near-continuous use on a proper test group, we can confidently say that shifting-by-wire doesn't just work; it's flat-out awesome.
Shifting performance that's second to none.
For the full review please view Bike Radar
Incredibly smooth, precise and reliable shift performance that cable-actuated systems can't match, but hugely expensive and multiple shift performance could be better
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