Ok, so it's a wireless paddle that tells a box on your chainstay to pull the cable of the stock RD? Is that what I'm seeing here? So you can use cheaper mechanical RDs but get electronic/lighter action shift buttons? Curioser...
Correct.
https://www.youtube.com/watch?v=kC-CsalVUCY
https://www.youtube.com/watch?v=QcVxyGsLKuQ
@pascalo started
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Ok, so it's a wireless paddle that tells a box on your chainstay to pull the cable of the stock RD? Is that what I'm seeing here? So you can use cheaper mechanical RDs but get electronic/lighter action shift buttons? Curioser...