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Shimano Dura Ace 7900 10 Speed Rear Derailleur
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Dura-Ace rear derailleur with lightweight carbon cage and wide link design gives quick accurate shifts, and unmatched drivetrain efficiency.
Full carbon fibre inner and outer pulley plates enhance rigidity and significantly reduce weight.
Image shows a carbon weave on the cage, cage is finished with a gloss coating but is still carbon
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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By using carbon fibre composite cage plates and jockey pulleys that spin on ceramic bearings, Shimano are clearly looking for more stiffness and less weight.
More weight is saved by the titanium main pivot bolt and cable clamp bolts - bringing the overall weight down to 165g - and the four pivot pins in the mech main body are fluorine-coated to reduce friction and increase durability.
And although that front plate pivot body (the bit that the mech cage fits into) looks like alloy, it isn't - it's a resin-reinforced thermoplastic.
The Shimano mech was slightly slower than its Campagnolo Record rival when it came to shifting but out on the road it felt quicker due to the smooth and near silent manner of those shifts.
It has a whopping 33-tooth capacity, which means it handles all of the available gear combinations in the Dura-Ace range with ease.
Functional and incredibly well made
There are a couple of big changes out back. First, you get a carbon pulley plate that brings down the weight (16g overall). Second, the new rear mech is compatible with cassettes up to 28T. The total capacity (the tooth difference between the two chainrings plus the tooth difference between the biggest and smallest sprockets) is now 33T - so you're unlikely to feel the need for a triple.
Once set up and bedded in, we had no troubles at all with shifting either up or down the cassette - all very precise and very definite in both directions with no need for any tweaking during the test period. What more can you ask for?
The increased capacity and precise shifting make it hard to beat
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