Shimano Ultegra Di2 RD-6870 Rear Derailleur - Road Bike Shop

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Shimano Ultegra Di2 RD-6870 Rear Derailleur
Retail Price: $279.95
Our Price: $209.99
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Even though Shimano's Dura-Ace Di2 remains steadfastly at the top of the podium, Shimano's Ultegra Di2 6870 Rear Derailleur is sneaking in to steal the show. While many lower-tier brand name groupsets seem to muddy the waters of their higher-end counterparts, so to speak, we don't feel that's the case with the 6870 series. In fact, it features much of the same level of performance as the Dura-Ace group, without quite the sticker shock. The rear derailleur received some exciting trickle-down love from Dura-Ace 9070, featuring a much slimmer profile than the previous Ultegra Di2 rear mech and also gaining the 11-speed shifting capability. The wiring has been cleaned up as well to ensure a very professional-looking kit, and the mid cage version can stretch to a 32t cog in the rear. The difference is mainly one of aesthetics and a few grams here and there. Where Dura-Ace Di2 uses custom servo motors, made exactly to Shimano's specs, its Ultegra Di2 derailleurs use off-the-shelf motors to drive the gear changes. The upsized internals determine the slightly larger overall package dimensions. E-tube technology is what sends Shimano electronic shifting at such blazing speeds. The best features have resulted from advancements in the software, allowing you to customize shifting speed and even program how many gears the rear derailleur shifts through when holding the shift button down. The 6870 rear derailleur even has built in crash protection, forcing the rear mechanism to compact and tuck away in the event of an accident. The 6870 Di2 rear derailleur offers shifting speed and quality that is on par with Dura-Ace 9070 Di2 -- the best shifting performance that Shimano has offered to date. And with 11 speeds in the rear, the perfect gear is just a click away. The Shimano Ultegra Di2 RD-6870 Rear Derailleur is available in both short and mid cage versions.