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Nah, its a closed system within the shifter. All the circuit boards and switches are in little boxes glued shut :(
We need to get Bunny Huang up in this shit. Tell him how Shimano has succeeded in preventing us from reverse engineering their gear for more than a decade, and he'll be grinding through that epoxy and sussing those guts through a microscope faster than you can say 'fuck proprietary bullshit'.
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Im 100% confident that I stumbled upon a guy who was making his own custom PCB's to connect into di2, and was selling them at about $50 a pop. Cant find it for the life of me. But its out there.
@hippy Im sure Shimano is collecting data on gear combos most used...etc, and carefully evaluates this data to bring to market the exact opposite of what people want :)
Nah, its a closed system within the shifter. All the circuit boards and switches are in little boxes glued shut :(