I only need a single TT shifter, rear derailler, battery, box, cables though.
Then don't buy the whole group?
"Looks like I'd have to buy it individually"
"6870 from Germany is your answer."
Yes so what you need is junction box A and B, internal battery, couple of SD50 cables, RD and TT shifter FROM GERMANY. See what that totals at £££.
@hippy started
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Then don't buy the whole group?