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Depending on the firmware loaded on the FD/RD (if you are buying second-hand) you can in theory run a hybrid 6770/6870 group as you would only need an 11 speed 6870 RD and could use either FD. After mid-2014 firmware means you need matchy FD/RD.
http://fitwerx.com/converting-shimano-ultegra-6770-di2-to-11-speed/
dubtap
Alan_tbt
Hi all, new to electronic and have picked up a pair of 6770 shifters - is this group worth pursuing? Or should I just keep saving for etap?
if anyone wants rid of comparable Di2 parts to get me on the road please drop me a message - I may be back later with some stupid questions about batteries, cables and the like!
Cheers!
Matt