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I've been avoiding Reading up on this. Because I dont want to spend more on the road bike.
But from what I've accidentally read. The New flashy DA Di2 groupset coming out. Has clever shifting and is adjustable using an app on Your phone. Basically you can programme it to shift a single gir upwards or downwards With a single click. The brain in the system will then automatically shift the front when that time comes.
The Nice bit is that to get these New features. You dont need the New New groupset. Just the New battery and junctionbox.
Smallfurry
The new junction box will be backwards compatible with older groupsets?