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Watch out, I thought these climbing switching connected to the STI shifters and not the junction box?
cgg-
From what i've read, it's the sprinters switches you can't connect directly to the junction box.
The climbers ones have all the tech inside them to operate by themselves.
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The R610 sprinter switches connect to the brifters because they don't have their own chips to join the CAN bus with. R600 Climbing/Pave shifters connect to the junction box because they have their own chips.
Soul
Emyr
So i can just buy two of these: http://www.chainreactioncycles.com/shimano-ultegra-di2-r600-climbing-shifter-switch/rp-prod85146, one for front (left hand side of bar) and one for rear (right hand side of bar)?