Providing quick and smooth shifting, the Shimano Ultegra Di2 RD-6770 Rear Derailleur boasts a wide gear ratio capacity that will cater for compact setups and the traditional road double. With programmed automatic motion at the flick of a switch, the electrical wires also allow for effortless gear shifts, whilst the four self-lubricating micro-machined fluorine-coated link pivot bushings provide low-friction shifting. - L.M.
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