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mtsdw
hippy
Does also depend on the build. Both my Di2 bikes were built up using individually sourced parts, which is a pain but I just didn't need all the parts in a groupset for either bike. There should be a list of parts you need in this thread. Basically with Di2 it's shifters, Junc A, Junc B, FD, RD, battery, cables. Mechanical is that minus junction boxes. Then you get into specifics like are you doing 1x? Are you using cable or hydro brakes? Which wheels are you using - what thru axle size and disc rotor type do you need?