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As far as I’m aware (from reading the internet) a 6770 front and 6870 rear won’t work together, mechs need to be the same series - 6770 shifters will work for 11speed though.
I’m about to build a bike with external battery as over the winter it’s less practical to bring a wet/muddy bike into the house to charge it as I had to with internal battery bike, just a thought... plus the charger for internal batteries are overpriced at £60 odd!
😬 what did I say wrong? You’re welcome to the 6770 front mech I have if you’d use it! I found it cheaper and easier to get 11speed together, 6770 shifters work with 6870 mechs and they are plentiful and cheap, especially if your Freehub body will take 11speed then why not 👍🏻👍🏻