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Someone's gonna crack it or come up with an open source alternative any day. Shimano and SRAM are going to cry when people get crappy old derailleurs working with 12+ speed for £50.
the simpleton's version would be this:
https://www.youtube.com/watch?v=RYgaulRbll0
tell it what derailleur you've got (whereupon it looks up pull ratio in a database) and what speed cassette (whereupon it sets the sprocket pitch). Just like a Rohbox.
frankenbike
@hippy
"Utilizing 128-bit encryption, eTap shift signals are transmitted and received in accordance with SRAM’s proprietary wireless protocol known as AIREA. Each time an eTap groupset is paired, a new encryption code is generated and assigned to the components in this group to ensure complete shifting security."
I want some SRAM now, just to see if I can fuck with it.