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4 comments
These may be of interest to you -
https://carltonbale.com/shimano-di2-everything-you-need-to-know/
https://bike.shimano.com/en-EU/e-tube/project/compatibility.html
PP
Thanks - the tables were very useful. I thought as much but hadn't managed to find that PDF anywhere, seeing it written down is reassuring though.
The derailleurs should mix and match. However, the older junction box won't support the new derailleurs IIRC. You'll also need to make sure all the firmware is on the same page.
Great, thanks a bunch!