Shimano Ultegra Di2 Rear Derailleur
Gone is the reliance on cable tension, indexing and a spring to control rear derailleur shifts, the Ultegra 6770 Di2 Rear Derailleur uses a worm drive to eliminate the pull and pull-back associated with a derailleur spring and cable. Once properly set up, the digital derailleur shifts with ultimate precision every time.
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