- Shimano Ultegra 6870 Di2 11 Speed Rear Derailleur
zoom Shimano Ultegra 6870 Di2 11 Speed Rear Derailleur
Shimano Ultegra 6870 Di2 11 Speed Rear Derailleur
Add Shimano Ultegra 6870 Di2 11 Speed Rear Derailleur to your basket now
|Grey||Medium Cage GS|
|Grey||Short Cage SS|
The Ultegra 6870 Di2 11 speed rear derailleur is now more compact and lighter with Shimano's E-Tube connection making installation simpler with wide gear ratio capacity for compact setups as well as the traditional road double.
Top Features of the Shimano Ultegra 6870 Di2 11 Speed Rear Derailleur
- Programmed automatic motion at the touch of a switch makes this derailleur quick, smooth and effortless to shift
- Automatic crash protection moves the cage out of harm's way
- Derailleur contains a saver (fuse) function, where the inner structure is protected from strong impacts
- 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
- 11-32T(GS) or 11-28T(SS) wide gear ratio capacity will cater for compact setups as well as the traditional road double
- 11-speed E-tube Di2 compatible
- Weight: 250g (SS), 260g (GS)
With Di2 technology shifting is easy and precise - just a light touch, as soft as a mouse click, is sufficient for the rear derailleur to instantaneously select the correct gear and the 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.
About Rear Derailleurs
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.
About the Shimano brand
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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Product Q & A
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If you do not do big hills you should not need a medium cage and a cassette with more than 28t. If you do lots of hills or hills from time to time then you would be well advised to install a Compact crankset with a medium cage Ultegra RD and a 32t-11t cassette. This will cover all bases and give you no negatives. This will give you lots of speed on the flats and lots of leverage on the hills. Even the some Pro's use Ultegra Di2 medium cage Di2 with a 32t cassette in the Tour de France.
If you are upgrading Di2 10 Speed to Di2 11 Speed bear in mind that Ultegra and Dura Ace components are compatible from the second generation Di2. See my reviews/answers on Wiggle for more information on this compatibility and its limitations. On my Cannondale EVO Race I run an Ultegra 11 speed RD medium cage with Dura Ace FD and Ultegra 10 speed Shifters [Shifters are simple switches so 11/10 speed 'talk' just fine].
The 6870 medium cage is a superb RD which will not disappoint and Wiggle's price is superb. We love Wiggle!
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