Shimano Ultegra 6870 Di2 Rear Derailleur
Shimano Ultegra 6870 Di2 Rear Derailleur
$156.24 - $166.61
RRP $229.16Save 32%
Code: RD6870
New product
  • With Di2 technology shifting is easy and precise - just a light touch, as soft as a mouse click, is sufficient for the front or rear derailleur to instantaneously select the correct gear
  • 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
  • GS Model for 11-32T wide gear ratio capacity will cater for compact setups as well as the traditional road double
  • SS Model for ratios up to 28 tooth
  • 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-speed E-tube Di2 compatible
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I bought this derailleur for a Di2 upgrade to my standard Ultegra groupset. It's brilliant, works effectively and efficiently, a great price and fantastic service from Merlin
Very accurate and smooth shifting, Easy to adjust and very reliable shifting, surprisingly light considering the extra electronic.
This is the medium cage Di2 derailleur which I needed for an 11-32T cassette. I replaced a DuraAce Di2 short cage. It really shifts fine, as good as the DuraAce in fact. But I did notice that the pulley wheels seemed to show wear more quickly - maybe not wear, but I think they are made of a different material than the DuraAce - no big deal though. Was instantly recognized in Etube and the firmware was up to date as well. Also, you can feel the weight difference. I would consider this a great purchase.