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One diagram I peeked at showed a wire from the battery going to a 3 way junction box.
The box had a wire going to the front shifters. In the rim brake version the shifters are wired, no wireless. I think they are identical to my 9100 ones, maybe with the smaller wire.
It would be nice if they work!
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davidual
Perhaps the market for TT di2 shifters isn’t strong enough, or market research suggests that people won’t upgrade from 11 to 12 speed if it meant messing with their cockpit setup?
I believe their rim brake drop bar STIs have to be wired as well and is a different shape to the disc versions, probably just a 9100 lever with a different socket.
So in theory, no reason why 9000/9100 levers can’t be programmed to do 12 speed.