Originally Posted by
TerryDi2C
There's a pretty big difference in the flexibility you get when setting up synchronized shift on 6870/9070 vs newer versions of Di2.
I asked Shimano about this once, but they couldn't give a good reason for this.. other than an oversight
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Also... Synchronized Shift settings or profiles are tied to the cassette/crankset that were selected at the time the settings were created. Change either of those in the app, and you won't be able to use synchro profiles used with other settings
As I recall from playing with 11 spd. you can tell the system you have some crank and cassette combo that is different then what’s really installed, so. 36/52 crank in place of a 34/50. Some crank and cassette combos allow things like using small/small, where telling it you’ve got a a 34/50 and 11-23 or such, the system would not allow small/small and you could not shift to small/small, it was locked out. As well, the crank and cassette you tell the system you are using need to be something Shimano currently sells. I tried to tell my 11. Spd system I had an 11-23 cassette, which they used to make and then discontinued. It would not accept that cassette.